test(file cache parallel reads): Enabling parallel reads from file cache

[abhishek10004]

1. Enabled concurrent read tests for file cache as well
2. Updated the test name for one of the e2e tests

Description

Link to the issue in case of a bug fix.

b/465027261

Testing details

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

Any backward incompatible change? If so, please explain.

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (a6ed753) to head (b9b77c2).
⚠️ Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #4118       +/-   ##
==========================================
- Coverage   83.31%       0   -83.32%     
==========================================
  Files         153       0      -153     
  Lines       18634       0    -18634     
==========================================
- Hits        15525       0    -15525     
+ Misses       2540       0     -2540     
+ Partials      569       0      -569     

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