Fixes and improvements: (#87218)

Fixes and improvements: (#87218)

- Fix hang bug caused by race condition in change_heap_count
- Change way we store dynamic heap input metrics to make it easier to surface them via ETW events.
- Refactor enter_spin_lock_msl into an inlineable part and a slower, more complex out-of-line part.
- Subtract time spent in safe_switch_to_thread and WiatLongerNoInstru from msl wait time - this makes this metric much less noisy.
- add more diagnostic output to check_heap_count and change_heap_count.
- add more spinning to EnterFinalizeLock to address slow suspensions in some ASP.NET benchmarks.