Adjust non-PR triggers
Adjust non-PR triggers

1. Enable weekly Ubuntu arm32 GCStress jobs.
2. Fix bugs where both flow and non-flow jobs were being triggered for some configurations.
3. Convert Windows ARM push jobs to daily jobs to conserve limited hardware.
4. Convert Windows ARM64 every-four-hour jobs to daily jobs to conserve limited hardware.
5. Convert Windows ARM64 R2R baseline job from daily to weekly to conserve limited hardware.
6. For altjit jobs, only do push jobs for Checked builds; there's no need for more than that.
7. Add Windows and Ubuntu ARM R2R weekly jobs.
8. Add Windows ARM and ARM64, and Ubuntu ARM, weekly R2R JIT stress jobs.

Fixes #17572, #17241.

wtgodbe/coreclr,mmitche/coreclr,krk/coreclr,krk/coreclr,poizan42/coreclr,mmitche/coreclr,mmitche/coreclr,mmitche/coreclr,krk/coreclr,cshung/coreclr,krk/coreclr,wtgodbe/coreclr,poizan42/coreclr,wtgodbe/coreclr,krk/coreclr,cshung/coreclr,cshung/coreclr,poizan42/coreclr,poizan42/coreclr,poizan42/coreclr,cshung/coreclr,wtgodbe/coreclr,cshung/coreclr,mmitche/coreclr,wtgodbe/coreclr,poizan42/coreclr,wtgodbe/coreclr,cshung/coreclr,krk/coreclr,mmitche/coreclr