AX: Update the isolated tree in response to dynamic aria-haspopup and aria-describedb...

AX: Update the isolated tree in response to dynamic aria-haspopup and aria-describedby changes
https://bugs.webkit.org/show_bug.cgi?id=240968

Reviewed by Chris Fleizach.

Testcases added to aria-describedby-on-input.html
and element-haspopup.html to cover this change.

* LayoutTests/accessibility/aria-describedby-on-input-expected.txt:
* LayoutTests/accessibility/aria-describedby-on-input.html:
* LayoutTests/accessibility/element-haspopup-expected.txt:
* LayoutTests/accessibility/element-haspopup.html:
* LayoutTests/platform/ios/accessibility/aria-describedby-on-input-expected.txt: Added.
* LayoutTests/platform/ios/TestExpectations:
* Source/WebCore/accessibility/AXLogger.cpp:
(WebCore::operator<<):
* Source/WebCore/accessibility/AXObjectCache.cpp:
(WebCore::AXObjectCache::handleAttributeChange):
(WebCore::AXObjectCache::updateIsolatedTree):
* Source/WebCore/accessibility/AXObjectCache.h:

link: https://commits.webkit.org/251049@main
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@294938 268f45cc-cd09-0410-ab3c-d52691b4dbfc