[Tooling] Migrate Prototype Builds from App Center to Firebase App Distribution

[AliSoftware]

Description

This migrates the Prototype Builds to be uploaded to Firebase App Distribution instead of App Center.

This is done in the context of App Center shutting down at the end of the month.

Internal references:

• pdnsEh-1zD-p2
• paaHJt-7S2-p2
• 186-gh-Automattic/apps-infra-plans

Release Timing

Important

We might want to wait before merging this until our internal documentation—about how to use our internal tools to enroll to Firebase App Distribution—has been updated.

Testing

• Check that the information shown in the PR comment looks accurate, including the build number (expected to be set to the Buildkite build number) and version (expected to use the PR number)
• Add yourself to the appropriate Testing Group via our MC tool (/mobile/firebase-app-distribution/testers/), then accept the invitation email you received
• Scan the QR code in the PR comment with your iPhone and confirm you can install the prototype build on your device

[pocketcasts]

📲 You can test the changes from this Pull Request in Pocket Casts Prototype Build by scanning the QR code below to install the corresponding build.

	App Name	Pocket Casts Prototype Build
	Build Number	9886
	Version	PR #2857
	Bundle ID	au.com.shiftyjelly.podcasts.prototype
	Commit	79d3719
	Installation URL	2ml17507rn3co

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[twstokes]

LGTM 🚀

[SergioEstevao]

The MC tool didn't work correctly in order to add me to the Firebase Group. But after I was added manually all worked correctly!
App installed and working on my device!