Cleanup the .github/workflows folder (#44857)

Summary:
Just doing some cleanup of the `.github/workflows` folder:
* apply-version-label-issue.yml hasn't been working since 0.72
* ios-tests is unnecessary as it's now covered by test-all
* nightlies-feedback.yml was experimental and last execution was ~5 months ago.

We can still recover them from the Git history if necessary.

## Changelog:

[INTERNAL] - Cleanup the .github/workflows folder

Pull Request resolved: https://github.com/facebook/react-native/pull/44857

Test Plan: Will wait for CI result

Reviewed By: NickGerleman

Differential Revision: D58362912

Pulled By: cortinico

fbshipit-source-id: d886e4f077eebfdf906169f09f96a950a361cab7