Unify release pipelines AzDO resources

[oleksandr-didyk]

Currently release infrastructure consists of two pipelines (release and source-build), each one having their own AzDO resources that are under different subscriptions.

We should unify them, ideally by moving the resources from the smallest source-build one to the release one. This would add simplicity in management, maintenance and access control as well as will underline the source-build release pipeline being on-par with the release pipeline (and not a detached second-class citizen)

The inventory of resources used by the source-build release pipeline can be found in https://github.com/dotnet/arcade-services/issues/2670

When moving the resources we need to make sure that they are easily accessible by all members of the Source-Build team. In particular, this would mean that the resources should remain PME-free

[oleksandr-didyk]

Moved out of the release pipeline testability milestone as it is not required for that effort and currently is not top priority