Polish AutomationProperties and UIA Tree Navigation

[carlos-zamora]

AutomationProperties of interest in this PR include...

• Name: the name of a UI element (generally used as the main identifier
  for it)
• HelpText: an additional description for a more complex UI element
• AccessibilityView[1]
  • Raw: hide from the UIA tree. Only navigate to this if you know what
    you're doing
  • Control: a control without any content in it. Basically, a point at
    which the user can make a decision as to how to navigate the tree or
    invoke an action.
  • Content: a control that also has content to present to the user.

I set a few more AutomationProperties throughout Windows Terminal...

• MinMaxClose Control: hidden (we can/should rely on the true buttons
  that we are hiding)
• SplitButton: Name and Help text (currently ignored due to Update AutomationProperties for SplitButton #4804, but
  having it in the resource file won't cause any problems)
• SearchBox: added a more specific name to the close button
• BackgroundImage: hide it

References

A few additional work items have been created for tracking...

• SplitButton: Update AutomationProperties for SplitButton #4804

PR Checklist

• Closes Feature Request: Automation Properties #2099
• Closes Feature Request: Clean up UIA Tree Navigation #2102

Validation Steps Performed

Verified using Accessibility Insights and Inspect.exe

[1] https://docs.microsoft.com/en-us/windows/win32/winauto/uiauto-treeoverview

[ghost]

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