Internal: b/227167830

When a Button is wrapped by PointerInterceptor, it becomes not accessible (TalkBack doesn't read that there's a button).

Maybe the empty div on the pointer interceptor needs aria-hidden="true"?

Note: this works for desktop web, just not Android/iOS.

Steps to Reproduce

1. Create a default flutter app
2. Check that talkback works on the FaB
3. Wrap the FaB in a PointerInterceptor
4. Check that talkback does NOT work on the FaB.

Expected results:

• I expect the button to be read by the screen-reader.

Actual results:

• The button is not found by the screen-reader.

(Reported internally)