Convert to arcade YAML templates

[JunTaoLuo]

Follow up to #11122 for the work item to use the Arcade YAML templates for CI definition.

Converting to the stages templates should also help with maestro publishing.

[dougbu]

• aspnet/AspNetCore-Tooling (dotnet/razor@baffa5b683)
• aspnet/Blazor (dotnet/blazor@c3a792e46dd1)
• aspnet/EntityFramework6 (dotnet/ef6@117e11461ac7)
• aspnet/EntityFrameworkCore (dotnet/efcore@7c021e42a041)
• aspnet/Extensions (dotnet/extensions@3d689a22e97d)
• aspnet/AspNetCore