[visionOS] Add min_visionos_version_supported to ruby methods

[Saad Najmi (Saadnajmi)]

Please select one of the following

• I am removing an existing difference between facebook/react-native and microsoft/react-native-macos 👍
• I am cherry-picking a change from Facebook's react-native into microsoft/react-native-macos 👍
• I am making a fix / change for the macOS implementation of react-native
• I am making a change required for Microsoft usage of react-native

Summary:

This PR is part of a series of PRs for adding support for visionOS to the repository. See #2019 .

Add the ruby helper methods to add visionos to all of our podspecs. Because RNTester doesn't yet have a scheme targetting visionOS, cocoapods won't generate the extra visionOS targets when we run pod install. Therefore, this change should mostly be a no-op.

Changelog:

[IOS] [CHANGED] - [visionOS] Add min_visionos_version_supported to ruby methods

Test Plan:

CI should pass.