test: add history endpoint tests (skipped due to missing implementati…

[Shruti1420]

Summary

This PR improves test coverage for history-related functionality as described in issue #833.

Changes Made

• Added tests for:

  • Maximum code length validation (max_length=50000)
  • Pagination limit boundary validation
  • Search limit validation
  • SHA256 code hash verification
  • Repeated deletion behavior (second delete returns 404)

Important Note

The repository currently does not implement /history/ endpoints.
To prevent CI failures, these tests are marked as skipped using pytest.

Benefits

• Improves coverage for validation and edge cases
• Prepares the test suite for future history feature implementation
• Helps prevent regressions once endpoints are added

Verification

• All existing tests pass ✅
• History tests are safely skipped ⚠️

Issue

Closes #833

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[Shruti1420]

Hi! I have added tests for history endpoints as per issue #833.

Since the endpoints are not implemented yet, I have skipped those tests to avoid CI failures.

Please let me know if any changes are required.