Add getopt in e2e script for enhanced command line arg handling.

[meet2mky]

Description

Adding getopt option in e2e test run script which offers enhanced arg handling and clean way of executing script.
Ref: https://www.man7.org/linux/man-pages/man3/getopt.3.html
Fixed optional resource usage collection in e2e script as per the comment in : #3414 (comment)

Example ways to run the script~

$ ./tools/integration_tests/improved_run_e2e_tests.sh --bucket-location us-central1

$ ./tools/integration_tests/improved_run_e2e_tests.sh --bucket-location us-central1 --presubmit

$ ./tools/integration_tests/improved_run_e2e_tests.sh --bucket-location us-central1 --presubmit --zonal

Example ways to not run the script~

$ ./tools/integration_tests/improved_run_e2e_tests.sh 
[INFO] 2025-06-25 11:12:10: Bash version: 5.2
[ERROR] 2025-06-25 11:12:10: Invalid or empty value [] for option --bucket-location.
Usage: ./tools/integration_tests/improved_run_e2e_tests.sh [options]
Options:
  Required:
    --bucket-location             <location>     The Google Cloud Storage bucket location (e.g., 'us-central1').

  Optional:
    --test-installed-package                     Test installed gcsfuse package. (Default: false)
    --skip-non-essential-tests                   Skip non-essential tests inside packages. (Default: false)
    --tpc-endpoint                               Run tests on TPC endpoint. (Default: false)
    --presubmit                                  Run tests with presubmit flag. (Default: false)
    --zonal                                      Run tests with zonal bucket. (Default: false)
    --no-build-binary-in-script                  To disable building gcsfuse binary in script. (Default: false)
    --package-level-parallelism   <parallelism>  To adjust the number of packages to execute in parallel. (Default: 10)
    --track-resource-usage                       To track resource(cpu/mem/disk) usage during e2e run. (Default: false)
    --help                                       Display this help and exit.


$ ./tools/integration_tests/improved_run_e2e_tests.sh --bucket-location
[INFO] 2025-06-25 11:12:38: Bash version: 5.2
./tools/integration_tests/improved_run_e2e_tests.sh: option '--bucket-location' requires an argument

$ ./tools/integration_tests/improved_run_e2e_tests.sh --bucket-location ""
[INFO] 2025-06-25 11:13:19: Bash version: 5.2
[ERROR] 2025-06-25 11:13:19: Invalid or empty value [] for option --bucket-location.

$ ./tools/integration_tests/improved_run_e2e_tests.sh --bucket-location --another-param
[INFO] 2025-06-25 11:13:50: Bash version: 5.2
[ERROR] 2025-06-25 11:13:50: Invalid or empty value [--another-param] for option --bucket-location.

$ ./tools/integration_tests/improved_run_e2e_tests.sh --bucket-location us-central1 --non-existent-flag
[INFO] 2025-06-25 11:14:27: Bash version: 5.2
./tools/integration_tests/improved_run_e2e_tests.sh: unrecognized option '--non-existent-flag'

$ ./tools/integration_tests/improved_run_e2e_tests.sh --bucket-location us-central1 --presubmit=some-value
[INFO] 2025-06-25 11:15:00: Bash version: 5.2
./tools/integration_tests/improved_run_e2e_tests.sh: option '--presubmit' doesn't allow an argument

Link to the issue in case of a bug fix.

b/426462003

Testing details

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

Any backward incompatible change? If so, please explain.

No

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.04%. Comparing base (b190907) to head (791043b).
Report is 17 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3433      +/-   ##
==========================================
+ Coverage   78.82%   79.04%   +0.22%     
==========================================
  Files         139      140       +1     
  Lines       18440    18520      +80     
==========================================
+ Hits        14535    14640     +105     
+ Misses       3421     3395      -26     
- Partials      484      485       +1     

Flag	Coverage Δ
unittests	79.04% <ø> (+0.22%)	⬆️

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[github-actions]

Hi @Tulsishah, @anushka567, your feedback is needed to move this pull request forward. This automated reminder was triggered because there has been no activity for over 24 hours. Please provide your input when you have a moment. Thank you!

[meet2mky]

@gemini-code-assist /gemini review

[gargnitingoogle]

Sorry, I couldn't finish reviewing it earlier in the day. Couple more comments.

[raj-prince]

Relying on Nitin's review!