Core-Setup stages-based publishing complete

[dagood]

Completed by dotnet/core-setup#7725 (master) and dotnet/core-setup#7735 (release/3.0).

Here's a 3.0 build with the changes: https://dev.azure.com/dnceng/internal/_build/results?buildId=315618&view=results.

🎉

/cc @dleeapho @markwilkie

[JohnTortugo]

Thanks @dagood

[dagood]

Ah, an exclusion causes the required checks not to run:

arcade/azure-pipelines.yml

Lines 7 to 14 in e0e43b8

	pr:
	branches:
	include:
	- master
	- templates
	paths:
	exclude:
	- Documentation/*

My previous PRs were merged regardless--doing the same here.

[markwilkie]

nice!!