GC long running tests (dotnet/coreclr#26489)
* - add gc-longrunning pipeline to run GC long running tests.
- make GC reliability framework one of GC long running tests.
* Temporarily enable Win10.ARM64 helix queue - for this PR only
* increase timeouts
* fewer inner cycles per one iteration in slower tests.
* Final touches - increase GC reliability Framework timeout to 60min.
remove Windows.10.Arm64.Open from the platform matrix (was added temporarily just to test this PR)
* Disable ARM for now.
Commit migrated from https://github.com/dotnet/coreclr/commit/
6b3b77a181176b9a83c4a8d1bf40ef6b8981da64