[testing-on-gke part 1.4] Update parse_tests scripts based on workload config parsers

[gargnitingoogle]

Description

This adds on top of #2247, #2284, #2264, #2268 and #2270 .

This is followed up in #2272 .

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

All modified and coverable lines are covered by tests ✅

Project coverage is 79.07%. Comparing base (dc07f21) to head (6f52f00).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2271      +/-   ##
==========================================
+ Coverage   79.03%   79.07%   +0.03%     
==========================================
  Files         105      105              
  Lines       11654    11654              
==========================================
+ Hits         9211     9215       +4     
+ Misses       1978     1975       -3     
+ Partials      465      464       -1     

Flag	Coverage Δ
unittests	79.07% <ø> (+0.03%)	⬆️

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