Move load_test_scripts to gcsfuse-tools repo

[raj-prince]

Description

Moving load_scripts to gcsfuse-tools repo. PR

No change required other than moving the scripts as this script is manual and not used by any CI/CD trigger.

Motivation:

• See, 4 open alerts in this script
  

Link to the issue in case of a bug fix.

b/416204955

Testing details

1. Manual - NA
2. Unit tests - NA
3. Integration tests - NA

Any backward incompatible change? If so, please explain.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.81%. Comparing base (cdc860b) to head (7e1a384).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3339      +/-   ##
==========================================
+ Coverage   78.77%   78.81%   +0.03%     
==========================================
  Files         131      132       +1     
  Lines       17997    18021      +24     
==========================================
+ Hits        14178    14203      +25     
  Misses       3345     3345              
+ Partials      474      473       -1     

Flag	Coverage Δ
unittests	78.81% <ø> (+0.03%)	⬆️

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