ci: Add `unsupported-version` label action (#35849)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/35849

Users will provide issues or examples that use unsupported versions of React Native. Provide label to track and ask them to update example / issue to currently mainted version.

Changelog:

[Internal] - Support 'unsupported version' tag comment

Reviewed By: cortinico

Differential Revision: D42531703

fbshipit-source-id: 5577943a329e17147269b9e5a5da2b2c16a6ae3e