[NO-TICKET] Don't put results in benchmarking folder directly

**What does this PR do?**

This PR tweaks the configuration for benchmark output results to place
result files in the current directory the benchmark gets executed from,
instead of placing the results in the benchmarks directory.

**Motivation:**

In #3810 we standardized the results output file name in benchmarks to
match the benchmark name.

In that PR, we used `__FILE__` as a prefix. This changed where results
are placed: where previously they were placed in the current folder
where the benchmarks were run from (often the root of the repo), with
this PR, they started getting placed in the benchmarks directory.

This clashes with our `validate_benchmarks_spec.rb` that look for
files in those directories, e.g. running a benchmark and then running
the test suite will make the test suite fail which is somewhat
annoying.

While I could've changed the tests to filter out results files, I also
find it useful to place the results where I'm executing the benchmarks
from, as it makes organization easier (you just run the benchmark from
where you want and you get the result there ).

**Additional Notes:**

N/A

**How to test the change?**

Run the benchmarks and confirm the results file gets placed in the
current folder! :)

benchmarks/library_gem_loading.rb

@@ -34,7 +34,7 @@ def benchmark_gem_loading
           raise unless status.success?
         end
 
-        x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+        x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
         x.compare!
       end
     RUBY

benchmarks/profiler_allocation.rb

@@ -28,7 +28,7 @@ def run_benchmark
 
       x.report('Allocations (baseline)', 'BasicObject.new')
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
 
@@ -50,7 +50,7 @@ def run_benchmark
 
       x.report("Allocations (#{ENV['CONFIG']})", 'BasicObject.new')
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
   end

benchmarks/profiler_gc.rb

@@ -43,7 +43,7 @@ def run_benchmark
         Datadog::Profiling::Collectors::ThreadContext::Testing._native_sample_after_gc(@collector)
       end
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
 
@@ -69,7 +69,7 @@ def run_benchmark
         @recorder.serialize
       end
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
 
@@ -81,7 +81,7 @@ def run_benchmark
 
       x.report('Major GC runs (profiling disabled)', 'GC.start')
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
 
@@ -100,7 +100,7 @@ def run_benchmark
 
       x.report('Major GC runs (profiling enabled)', 'GC.start')
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
 
@@ -114,7 +114,7 @@ def run_benchmark
 
       x.report('Allocations (profiling disabled)', 'Object.new')
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
 
@@ -133,7 +133,7 @@ def run_benchmark
 
       x.report('Allocations (profiling enabled)', 'Object.new')
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
 

benchmarks/profiler_hold_resume_interruptions.rb

@@ -28,7 +28,7 @@ def run_benchmark
         Datadog::Profiling::Collectors::CpuAndWallTimeWorker._native_resume_signals
       end
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
   end

benchmarks/profiler_http_transport.rb

@@ -86,7 +86,7 @@ def run_benchmark
         run_once
       end
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
   end

benchmarks/profiler_memory_sample_serialize.rb

@@ -83,7 +83,7 @@ def run_benchmark
         recorder.serialize
       end
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
   end

benchmarks/profiler_sample_loop_v2.rb

@@ -51,7 +51,7 @@ def run_benchmark
         Datadog::Profiling::Collectors::ThreadContext::Testing._native_sample(@collector, PROFILER_OVERHEAD_STACK_THREAD)
       end
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
 

benchmarks/profiler_sample_serialize.rb

@@ -53,7 +53,7 @@ def run_benchmark
         nil
       end
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
 

benchmarks/tracing_trace.rb

@@ -46,7 +46,7 @@ def trace(x, depth)
       trace(x, 10)
       trace(x, 100)
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
   end
@@ -74,7 +74,7 @@ def trace(x, depth)
       trace(x, 10)
       trace(x, 100)
 
-      x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+      x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
       x.compare!
     end
   end
@@ -88,7 +88,7 @@ def benchmark_to_digest
           trace.to_digest
         end
 
-        x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+        x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
         x.compare!
       end
     end
@@ -103,7 +103,7 @@ def benchmark_log_correlation
           Datadog::Tracing.log_correlation
         end
 
-        x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+        x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
         x.compare!
       end
     end
@@ -119,7 +119,7 @@ def benchmark_to_digest_continue
           Datadog::Tracing.continue_trace!(digest)
         end
 
-        x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+        x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
         x.compare!
       end
     end
@@ -148,7 +148,7 @@ def benchmark_propagation_datadog
           raise unless extracted_trace_digest
         end
 
-        x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+        x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
         x.compare!
       end
     end
@@ -171,7 +171,7 @@ def benchmark_propagation_trace_context
           raise unless extracted_trace_digest
         end
 
-        x.save! "#{__FILE__}-results.json" unless VALIDATE_BENCHMARK_MODE
+        x.save! "#{File.basename(__FILE__)}-results.json" unless VALIDATE_BENCHMARK_MODE
         x.compare!
       end
     end