Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53794

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54727

This means skipping any test that requires creating a folder as the
test would be unable to clean up after itself.
Add a test to show that there is the same issue with tasks by creating
one in the root folder.

Wine-Bug: https://bugs.winehq.org//show_bug.cgi?id=54106

Being in the administrator group is not sufficient.

It is a macro and thus constant unlike HRESULT_FROM_WIN32().

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54701

Simplifying and fixing it.

Signed-off-by: Connor McAdams <cmcadams@codeweavers.com>

uiautomationcore: Add a helper function for retrieving a property value from an individual node provider.
Signed-off-by: Connor McAdams <cmcadams@codeweavers.com>

uiautomationcore/tests: Add NULL input argument tests for IUIAutomationTreeWalker navigation method.
Signed-off-by: Connor McAdams <cmcadams@codeweavers.com>