tvOS: Remove vpx_loop_filter_manager.*

[rakuco]

These files were needed by vpx_video_decoder.*, which were removed in #8336 because they were only used in decode to texture mode.

Bug: 459507205
Bug: 447334535

[github-actions]

🤖 Gemini Suggested Commit Message

---

tvos: Remove VPX loop filter manager

The vpx_loop_filter_manager files are no longer required. They were
dependencies of vpx_video_decoder, which was removed in a prior change.
The vpx_video_decoder was exclusively used by the decode-to-texture
mode, which is no longer in use. This change cleans up the obsolete
files from the tvOS media component.

Bug: 459507205
Bug: 447334535

---

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[gemini-code-assist]

Code Review

This pull request removes the vpx_loop_filter_manager.cc and vpx_loop_filter_manager.h files. As stated in the description, these files are no longer needed since their dependents, vpx_video_decoder.*, were removed in a previous change. This appears to be a correct and straightforward code cleanup. I have no issues to report.

[rakuco]

cc @abhijeetk @jkim-julie @Gyuyoung