## Summary of the Pull Request
As a part of the Interactivity split, `TermControlAutomationPeer` had to be split into `TermControlAutomationPeer` (TCAP) and `InteractivityAutomationPeer` (IAP). Just about all of the functions in `InterativityAutomationPeer` operate by calling the non-XAML UIA Provider then wrapping the resulting `UIATextRange` into a XAML format (a `XamlUiaTextRange` [XUTR]). As a part of that XUTR constructor, we need a reference to the parent provider.

We generally get that via `ProviderFromPeer()`, but IAP's `ProviderFromPeer()` returned null (presumably because IAP isn't in the UI tree, whereas TCAP is directly registered as the automation peer for the `TermControl`).

It looks like some screen readers didn't care (like NVDA, though there may be a chance we just didn't encounter an issue just yet), but Narrator definitely did.

The fix was to provide XUTR constructors the `ProviderFromPeer` from TCAP, _not_ IAP. To accomplish this, IAP now holds a weak reference to TCAP, and provides the `ProviderFromPeer` when needed. We can't cache this result because there is no guarantee that it won't change.

Some miscellaneous changes include:
- `TermControl::OnCreateAutomationPeer` now returns the existing auto peer instead of always creating a new one
- `TCAP::WrapArrayOfTextRangeProviders` was removed as it was unused (normally, this would be directly affected by the main `ProviderFromPeer` change here)
- `XUTR::GetEnclosingElement` is now hooked up to trace logging for debugging purposes

## References
Introduced in #10051
Closes #11488 

## Validation Steps Performed
✅ Narrator scan mode now works (verified with character, word, and line navigation)
✅ NVDA movement still works (verified with word and line navigation)

## Summary of the Pull Request
As a part of the Interactivity split, `TermControlAutomationPeer` had to be split into `TermControlAutomationPeer` (TCAP) and `InteractivityAutomationPeer` (IAP). Just about all of the functions in `InterativityAutomationPeer` operate by calling the non-XAML UIA Provider then wrapping the resulting `UIATextRange` into a XAML format (a `XamlUiaTextRange` [XUTR]). As a part of that XUTR constructor, we need a reference to the parent provider.

We generally get that via `ProviderFromPeer()`, but IAP's `ProviderFromPeer()` returned null (presumably because IAP isn't in the UI tree, whereas TCAP is directly registered as the automation peer for the `TermControl`).

It looks like some screen readers didn't care (like NVDA, though there may be a chance we just didn't encounter an issue just yet), but Narrator definitely did.

The fix was to provide XUTR constructors the `ProviderFromPeer` from TCAP, _not_ IAP. To accomplish this, IAP now holds a weak reference to TCAP, and provides the `ProviderFromPeer` when needed. We can't cache this result because there is no guarantee that it won't change.

Some miscellaneous changes include:
- `TermControl::OnCreateAutomationPeer` now returns the existing auto peer instead of always creating a new one
- `TCAP::WrapArrayOfTextRangeProviders` was removed as it was unused (normally, this would be directly affected by the main `ProviderFromPeer` change here)
- `XUTR::GetEnclosingElement` is now hooked up to trace logging for debugging purposes

## References
Introduced in #10051
Closes #11488

## Validation Steps Performed
✅ Narrator scan mode now works (verified with character, word, and line navigation)
✅ NVDA movement still works (verified with word and line navigation)

(cherry picked from commit 02ac246)

…een wrong. I get all sorts of errors. I should to the opposite.

…o have been wrong. I get all sorts of errors. I should to the opposite."

This reverts commit bf0f516.

…een wrong. I get all sorts of errors. I should to the opposite.

(cherry picked from commit bf0f516)