Add nightly pipeline to run AI tests

[crazytonyli]

Note

This PR will be merged after #25550

Try the AI tests pipeline on CI to see how it works in the real world.

[wpmobilebot]

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

	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	32225
	Version	PR #25556
	Bundle ID	org.wordpress.alpha
	Commit	de01883
	Installation URL	70c7rpa5beq80

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

[wpmobilebot]

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

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	32225
	Version	PR #25556
	Bundle ID	com.jetpack.alpha
	Commit	de01883
	Installation URL	00c5uk8m8qs0o

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

[mokagio]

Ran a manual build of the new pipeline to verify if uploads fine

I didn't wait for the tests to finish. Just the fact they started running shows the pipeline — the content of this PR — is correct.