[testing-on-gke part 1.3] Allow any generic machine-type, and passing GCSFuse configuration, workload configuration in the pod configuration

[gargnitingoogle]

Description

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

This is followed up in #2271 .

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 79.06%. Comparing base (ed2ee46) to head (fcacc63).
Report is 1 commits behind head on garnitin/add-gke-load-testing/add-new-code/v2.

Additional details and impacted files

@@                                Coverage Diff                                @@
##           garnitin/add-gke-load-testing/add-new-code/v2    #2270      +/-   ##
=================================================================================
+ Coverage                                          78.70%   79.06%   +0.35%     
=================================================================================
  Files                                                105      105              
  Lines                                              11690    11620      -70     
=================================================================================
- Hits                                                9201     9187      -14     
+ Misses                                              2029     1972      -57     
- Partials                                             460      461       +1     

Flag	Coverage Δ
unittests	79.06% <ø> (+0.35%)	⬆️

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[gargnitingoogle]

Unintentionally closed because of the wrong dst branch. Reopened in #2367 .