No longer repeat focusing UIA consoles

[LeonarddeR]

Link to issue number:

Fixes #10030
Another attempt that replaces #10180

Summary of the issue:

When focusing UIA consoles, the focus object is sometimes repeated.

Description of how this pull request fixes the issue:

The parent window of the terminal text area sometimes steals the focus. This was fixed by adding a focusRedirect to that window, but it look like that was actually the cause of repeating the focus. Therefore, I removed the focus redirect and used shouldAllowUIAFocusEvent instead to avoid this window stealing the focus.

Testing performed:

Started the UIA console several times, no focus repeating occurred.
I would like @codeofdusk to share his ideas about this pr, because it removes an assumption made by him.

Known issues with pull request:

None

Change log entry:

• Bug fixes
  • When focusing a Windows command console with UIA enabled, the terminal is no longer announced multiple times. (repetition when focusing a console window #10030)

[codeofdusk]

I’ll test this shortly. No need for a changelog entry.

[codeofdusk]

Successfully re-tested the "console focus" section of the UIA console test plan. Observed no duplicate announcements, focus loss, or erroneous selections.