refactor(statsd): refactor workspace id and name retrieval

CHANGELOG/unreleased/kong/11442.yaml

@@ -0,0 +1,7 @@
+message: refactor workspace id and name retrieval
+type: performance
+scope: Core
+prs:
+- 11442
+jiras:
+- "FTI-5303"

kong/plugins/statsd/log.lua

@@ -132,8 +132,7 @@ local get_workspace_id = {
     return ws.get_workspace_id()
   end,
   workspace_name = function()
-    local workspace = ws.get_workspace()
-    return workspace.name
+    return ws.get_workspace_name()
   end
 }
 

kong/workspaces/init.lua

@@ -34,6 +34,11 @@ function workspaces.get_workspace()
 end
 
 
+function workspaces.get_workspace_name()
+  return "default"
+end
+
+
 function workspaces.set_workspace(ws)
   ngx.ctx.workspace = ws and ws.id
 end