[testing-on-gke part 3] Accidentally closed PR.. reopened at PR#2359

[gargnitingoogle]

Description

Support special cases

• Support instance_id
  1. Support env variable instance_id in run-script and in the python scripts (this allows multiple users to run the same tests using the same input/output bucket(s) without overwriting each others's outputs).
• Support multiple combinations of blockSize,numThreads,filesPerThread combinations for a given fileSize for fio tests, in the same run without overwriting each other.

This follows right after #2272 .

This is followed up in #2322 and in #2329 .

Link to the issue in case of a bug fix.

NA

Testing details

1. Manual - NA
2. Unit tests - NA
3. Integration tests - NA

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (garnitin/add-gke-load-testing/add-run-script/v1@790af9b). Learn more about missing BASE report.

Files	Patch %	Lines
cfg/types.go	0.00%	2 Missing ⚠️
cmd/legacy_main.go	0.00%	1 Missing ⚠️
internal/fs/fs.go	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                                Coverage Diff                                 @@
##             garnitin/add-gke-load-testing/add-run-script/v1    #2319   +/-   ##
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  Coverage                                                   ?   79.10%           
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  Files                                                      ?      105           
  Lines                                                      ?    11619           
  Branches                                                   ?        0           
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  Hits                                                       ?     9191           
  Misses                                                     ?     1969           
  Partials                                                   ?      459           

Flag	Coverage Δ
unittests	79.10% <55.55%> (?)

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[gargnitingoogle]

I closed this PR accidentally while pushing to the destination branch. I have reopened it in #2359 .