[deadlock fix] Remove lock for SIUP::GetSelectionRange() (microsoft#1…

…1386)

## Summary of the Pull Request
The deadlock was caused by `ScreenInfoUiaProviderBase::GetSelection()` calling `TermControlUiaProvider::GetSelectionRange` (both of which attempted to lock the console). This PR removes the lock and initialization check from `TermControlUiaProvider`. It is no longer necessary because the only one that calls it is `SIUPB::GetSelection()`.

Additionally, this adds some code that was useful in debugging this race condition. That should help us figure out any locking issues that may come up in the future.

## References
microsoft#11312
Closes microsoft#11385 

## Validation Steps Performed
✅ Repro steps don't cause hang