Redo: Modal dismissed by any button

[dkwingsmt]

Description

This is a redo of #32770, which was reverted because it was found to break apps in the following scenario:

• When there is a translucent Listener stacked on it that detects drags, the drag will always be rejected, because _AnyTapGestureRecognizer instantly claims victory to all PointerDownEvents.

This PR rewrites _AnyTapGestureRecognizer based on TapGestureRecognizer, which means it now competes in the arena with the same rule as normal taps.

It also adds a test that sets up the aforementioned scenario, which is failed by the previous implementation and passed by the new implementation.

Related Issues

• Previous attempt: Dismiss modal with any button press #32770

Tests

I added the following tests:

• ModalBarrier does not prevent interactions with translucent widgets in front of it

Checklist

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• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I signed the CLA.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.
• The analyzer (flutter analyze --flutter-repo) does not report any problems on my PR.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Does your PR require Flutter developers to manually update their apps to accommodate your change?

• Yes, this is a breaking change (Please read Handling breaking changes). Replace this with a link to the e-mail where you asked for input on this proposed change.
• No, this is not a breaking change.

[Piinks]

LGTM!