[Misc] Small: Remove global media connector. Each test should have its own test connector object.

[huachenheli]

Summary:
Exposing a globally shared global_media_connector instance just for test & example purposes is code smell. This PR removes it and instead has each test case keep its own MediaConnector instance for better test isolation.

Test Plan:
CI/CD

[github-actions]

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[gemini-code-assist]

Summary of Changes

Hello @huachenheli, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on a significant refactoring effort to improve the design of media handling within the project's examples and test suite. It moves away from a problematic global state for media connectors, instead adopting a pattern where each module manages its own MediaConnector instance. This change directly contributes to enhanced test isolation, reduced coupling, and a cleaner, more maintainable codebase.

Highlights

• Refactoring Global State: The pull request eliminates the use of a globally shared global_media_connector instance, addressing a 'code smell' and promoting better architectural practices.
• Enhanced Test and Example Isolation: Each test file and example script now instantiates its own dedicated MediaConnector object (e.g., OFFLINE_MEDIA_CONNECTOR or TEST_MEDIA_CONNECTOR). This ensures that media fetching operations are isolated, preventing potential side effects and improving the reliability of tests.
• Improved Code Maintainability: By replacing direct calls to global fetch_image, fetch_audio, and fetch_video utility functions with method calls on specific MediaConnector instances, the code becomes more modular, readable, and easier to maintain and extend in the future.

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[gemini-code-assist]

Code Review

This pull request refactors the codebase to remove the global media_connector, improving test isolation and code clarity. Each example and test file now instantiates its own MediaConnector. Formatting suggestions have been made to improve readability.

[DarkLight1337]

Thanks for cleaning this up!