fix: Search results are not fetching all files when the search box is empty(WPB-20817)

[arjita-mitra]

WPB-20817 [Web] Search results are not fetching all files when the search box is empty

Summary

Fixes an intermittent race in Conversation Files search where clearing the input could still show partial/stale results.

1. Added a request version gate so only the latest in-flight search can update state.
2. Clearing search now invalidates older requests immediately.
3. Prevented stale success/error responses from overwriting current file list state.
4. Extracted version gate logic into a pure utility (requestVersionGate) with focused unit tests.
5. Simplified tests by covering core concurrency behavior without heavy hook/store mocking.

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Security Checklist (required)

• External inputs are validated & sanitized on client and/or server where applicable.
• API responses are validated; unexpected shapes are handled safely (fallbacks or errors).
• No unsafe HTML is rendered; if unavoidable, sanitization is applied and documented where it happens.
• Injection risks (XSS/SQL/command) are prevented via safe APIs and/or escaping.

Accessibility (required)

• I have read and this PR upholds our Accessibility Best Practices.

Standards Acknowledgement (required)

• I have read and this PR upholds our Coding Standards and Tech Radar Choices.

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Screenshots or demo (if the user interface changed)

Notes for reviewers

• Trade-offs:
• Follow-ups (linked issues):
• Linked PRs (e.g. web-packages):

[github-actions]

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🧪 Playwright Test Summary

• ✅ Passed: 14
• ❌ Failed: 0
• ⏭ Skipped: 0
• 🔁 Flaky: 0
• 📊 Total: 14
• ⏱ Total Runtime: 191.7s (~ 3 min 12 sec)

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud