Submit to one Helix queue on pull requests and CI builds. Add CI trigger for master...

Submit to one Helix queue on pull requests and CI builds. Add CI trigger for master branch (dotnet/coreclr#22211)

This limits pull request and CI (push) triggered jobs to running only on one *default* Helix queue:

Linux arm32 - Ubuntu.1404.Arm32.Open
Linux arm64 - Ubuntu.1804.Arm64.Open
Linux x64 - Ubuntu.1804.Amd64.Open

Windows_NT x86/x64 - Windows.10.Amd64.Open
Windows_NT arm32/arm64 - we don't run these in AzDO

OSX - OSX.1013.Amd64.Open

Scheduled and manually triggered jobs will use more than one Helix queues for more comprehensive checking.

This enables CI (push) trigger for master branch. During CI build the following scenarios for Pri1 tests are going to run:
- normal
- no_tiered_compilation

Commit migrated from https://github.com/dotnet/coreclr/commit/1c5ac86fe4dcdd3f2e83e52049b1e393978698b0