[testing-on-gke part 5] Support per-workload gcsfuse-mount-options and other improvements

[gargnitingoogle]

Description

This adds the following changes

1. Now, gcsfuse_mount_options is no longer taken on the run-gke-tests.sh script, and is instead taken per workload in the ${workload_config} file. Sample at

   gcsfuse/perfmetrics/scripts/testing_on_gke/examples/workloads.json

   Line 18 in 57da96f

   "gcsfuseMountOptions": "implicit-dirs",

   ) .
2. helm chart names and pod names have been shortened by using a hash of the workload rather than the long names earlier used which encapsulated the workload parameters such as blockSize/numThreads/batchSize etc. It still keeps the name of the scenario and file-size in the pod/chart name for some information for easy spotting though.
3. Adds validation checks and unit tests for dlio_workload and fio_workload.

This is on top of #2329 . It is followed up in #2482.

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 78.82%. Comparing base (9209696) to head (32b31ba).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2348      +/-   ##
==========================================
- Coverage   78.88%   78.82%   -0.06%     
==========================================
  Files         106      106              
  Lines       11686    11686              
==========================================
- Hits         9219     9212       -7     
- Misses       1989     1997       +8     
+ Partials      478      477       -1     

Flag	Coverage Δ
unittests	78.82% <ø> (-0.06%)	⬇️

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