fix:: elevation and scrollUnderElevation depends on scrolling drawers on issue #120083

[Mairramer]

fixes #120083

Description
This PR addresses the following issues:

• Resolves the unexpected scrolledUnderElevation trigger that occurs when scrolling within the Drawer and NavigationDrawer.

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• I signed the CLA.
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or this PR is test-exempt.
• I followed the breaking change policy and added Data Driven Fixes where supported.
• All existing and new tests are passing.

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[Piinks]

Thank you for the update, I am still not sure this is the best way to resolve this issue. I think I recall @TahaTesser looking at this before. @TahaTesser do you have any thoughts on this? Or insight on your past investigation here?

[TahaTesser]

Thank you for the update, I am still not sure this is the best way to resolve this issue. I think I recall @TahaTesser looking at this before. @TahaTesser do you have any thoughts on this? Or insight on your past investigation here?

That's right, I attempted to this in https://github.com/flutter/flutter/pull/122600/files but we had to revert it|

Calling Scaffold.maybeOf to detect drawer and calling findAncestorStateOfType in the scroll notification is too expensive. Not a good idea to look up tree dozens of times as the user scrolls, if i remember correctly.