fix(patch): benchmarking and unsupported_path test fixes to v3.8.2

[PranjalC100]

Description

This PR backports two integration test fixes to the v3.8.2_release branch for GKE.

1. Benchmarking Fix (PR fix(integration_tests): prevent overwriting MntDir in GKE executions #4577): Prevents setup.MntDir from being overwritten by an empty directory during GKE execution.
2. Unsupported Path Fix (PR test(integration): remove unused mount configs #4623): Resolves test failures in unsupported_path caused by path joining logic.

Linked Issues

• https://buganizer.corp.google.com/issues/496956438#comment5

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v3.8.2_release@40dad1d). Learn more about missing BASE report.

Additional details and impacted files

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request backports critical integration test fixes to the v3.8.2_release branch. The changes primarily focus on stabilizing GKE execution environments by ensuring consistent mount directory management and correcting path-related logic that previously caused test failures. These adjustments improve the reliability of the benchmarking and unsupported path test suites.

Highlights

• Benchmarking Fix: Updated the benchmarking setup to correctly set the mount directory, preventing it from being overwritten by an empty directory during GKE execution.
• Unsupported Path Fix: Resolved test failures in the unsupported_path suite by refining the configuration and path joining logic in the test environment.
• Test Configuration Updates: Standardized the handling of mount and root directories across multiple integration test suites and updated the test configuration YAML to support necessary directory parameters.

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[gemini-code-assist]

Code Review

This pull request refactors the integration test setup across multiple test suites (including benchmarking, dentry_cache, stale_handle, and unfinalized_object) to consistently use local mountDir and rootDir variables instead of conditionally querying testEnv.cfg or setup.MntDir(). Additionally, it updates test_config.yaml to include the only_dir parameter for certain test suites, removes unused configuration keys, and cleans up formatting. There are no review comments, so I have no feedback to provide.