Fix: Crash when parsing MediaWiki error responses & Refactor Interceptor

[Inuth0603]

Summary

This PR fixes a crash (NullPointerException) that occurred when the MediaWiki API returned malformed error JSON (e.g., when trying to edit Depicts).

Changes

1. Fix Crash: Added try-catch blocks and null checks in the response interceptor to handle parsing errors safely without crashing the app.
2. Refactor: Extracted the private UnsuccessfulResponseInterceptor from OkHttpConnectionFactory.kt into its own public file named CommonsResponseInterceptor.kt.
   • This fixes visibility issues that prevented proper unit testing.
   • Renamed the class to CommonsResponseInterceptor for clarity.
3. Tests: Updated unit tests to verify that malformed JSON no longer causes a crash.

Related Issue

Fixes #6593

[Inuth0603]

I noticed the pull_request_unrelated_changes check failed with HttpError: Resource not accessible by integration.

This seems to be a permissions issue because I am submitting this PR from a fork (Action does not have write access). I haven't modified the workflow file to keep this PR clean, but let me know if you need me to update the workflow permissions."

[github-actions]

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