CI: validate JSON & fix benchmark

[Borda]

What does this PR do?

adding validation for action YAMLs and fix them

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[codecov]

Codecov Report

Merging #8567 (8ccb0e4) into master (eaa16c7) will increase coverage by 4%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #8567    +/-   ##
=======================================
+ Coverage      88%     92%    +4%     
=======================================
  Files         218     218            
  Lines       14405   14398     -7     
=======================================
+ Hits        12705   13296   +591     
+ Misses       1700    1102   -598     

[Borda]

need to be resolved microsoft/azure-pipelines-vscode#411 and python-jsonschema/check-jsonschema#10