Fixing ListBatches REST path filter silently returns empty on wrong batch_key encoding

[sergey3bv]

Should close #2080

[gemini-code-assist]

Summary of Changes

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This pull request addresses an issue where the ListBatches REST endpoint would silently return empty results when provided with incorrectly encoded batch keys. By migrating the path parameter to a string-based representation and introducing strict validation logic, the API now provides clear feedback when invalid inputs are received, improving robustness and developer experience.

Highlights

• REST API Path Update: Updated the ListBatches REST endpoint to use batch_key_str instead of batch_key in the path to ensure proper handling of batch key encoding.
• Error Handling: Implemented explicit validation for batch_key and batch_key_str filters, ensuring that malformed or empty keys now return an InvalidArgument error instead of silently returning empty results.
• Testing: Added a new integration test to verify that the REST endpoint correctly rejects malformed batch keys with appropriate status codes.

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[gemini-code-assist]

Code Review

This pull request updates the ListBatches REST endpoint to use batch_key_str in the path and ensures that malformed or empty batch keys return an InvalidArgument error. It also adds an integration test to verify correct handling of various batch key encodings. Feedback focuses on adhering to the repository style guide, specifically regarding the placement of comments within switch statements and the minimization of lines for error message formatting in rpcserver.go.

[sergey3bv]

Hey, @darioAnongba, I fixed your comments yet struggling to pass CI tests. Could you please help me with that?

[lightninglabs-deploy]

@sergey3bv, remember to re-request review from reviewers when ready