feat: Add comprehensive unit tests

[sadeeq6400]

Description:

This pull request introduces a comprehensive suite of unit tests for the dispute, external-validation, queue, and access-logs modules. The tests cover a wide range of scenarios, including service logic, controller behavior, and entity interactions.

Key Features:

• Dispute Module: Added unit tests for the DisputeService and DisputeController, ensuring that dispute creation, lifecycle, and access control are working as expected.
  Closes [BE-123] Unit tests for the dispute module #982

• External Validation Module: Implemented unit tests for the ExternalValidationService and ExternalValidationController, covering success and failure paths, as well as resilience.
  Closes [BE-124] Unit tests for the external-validation module #983

• Queue Module: Added unit tests for the QueueService and DocumentProcessor, verifying that jobs are enqueued and processed correctly.
  Closes [BE-125] Unit tests for the queue module #984

• Access Logs Module: Expanded test coverage for the AccessLogsService, ensuring that logs are created, queried, and filtered as expected.
  Closes [BE-126] Expand access-logs module test coverage #985

Testing:

• All new features are covered by unit tests.
• Existing functionality is not affected.

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[vercel]

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[mftee]

@sadeeq6400 This PR currently has a merge conflict with the main branch (mergeable_state: dirty), so it can't be merged as-is. Could you please rebase or merge main into your branch and resolve the conflicting files? Requesting changes until this is resolved.

[mftee]

Conflict has been resolved and the branch is clean against main now. The comprehensive unit test additions look good - approving.