Publish a Mac Catalyst app to the App Store

[davidbritch]

At the moment the publish a Mac app doc is CLI only, for unsigned apps.

The story for Mac Catalyst publishing is that it's not possible on Windows, but it is possible on a Mac. However, it's not currently possible as an end-to-end scenario in VSMac. The solution is:

1. Create certs in your Apple Developer Account.
2. Use the Apple developer portal to create the App ID and provisioning profile.
3. Set entitlements, depending on your distribution channel.
4. Edit your .csproj to add the required build properties (which are different depending on how you're distributing your app).
5. Use the CLI to publish the app.

This approach requires an Apple Distribution certificate, and a Mac Installer certificate.

Create a doc that covers distribution to the App Store using this approach.

Note: this distribution channel is only an option for individual Apple accounts.

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Associated WorkItem - 66534