build: remove macOS CocoaPods integration

[andrewkolos]

Partially addresses #929.

Addresses the problem for catalog_gallery, simple_chat, and verdure.

I also ran builds to regenerate a bunch of files.

Pre-launch Checklist

• I read the Flutter Style Guide recently, and have followed its advice.
• I signed the CLA.
• I read the Contributors Guide.
• I have added sample code updates to the changelog.
• I updated/added relevant documentation (doc comments with ///).
• If my PR is a fork PR, I've checked that [e2e tests] passed.

If you need help, consider asking for advice on the #hackers-devrel channel on Discord.

[gemini-code-assist]

Code Review

This pull request focuses on removing CocoaPods dependencies and associated configurations from multiple projects, including catalog_gallery, composer, simple_chat, and verdure. Key changes include the deletion of Podfiles and Podfile.lock files, removal of Pods-related build phases and framework references in Xcode project files, and the transition from FVPVideoPlayerPlugin to VideoPlayerPlugin in generated plugin registrants. Additionally, the jni plugin has been added to the FLUTTER_FFI_PLUGIN_LIST for Linux and Windows platforms. I have no feedback to provide.