Migrate to GitHub Actions

[Saadnajmi]

We currently use Azure Pipelines for our CI. Despite using the same images as GitHub Actions, they tend to be behind. This has consistently caused issues with keeping RNM up to date on the latest Xcode version and SDKs. Currently, this blocks us from moving to Xcode 16 because:

• Xcode 16 was removed from the macOS 14 image
• The macOS 15 images are not guaranteed to be on ARM, so we lose visionOS.

[Saadnajmi]

Closed with #2590