Expose clipBehavior in simple dialog

[Amitpatil215]

Description

• Modified
  • adding clipBehavior property to the simpleDialog.
• Earlier
  • There is no way to customize clipBehavior.

Related PR:

Earlier this /pull/50775 having modifications related to clipBehavior of Alert Dialog has been merged.

Issue

fixes #74414

Tests

I added tests to the dialog_test.dart that tests clipBehaviour properties.

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 listed at least one issue that this PR fixes in the description above.
• I added new tests to check the change I am making or feature I am adding, or Hixie said the PR is test exempt.
• I updated/added relevant documentation (doc comments with ///).
• I signed the CLA.
• All existing and new tests are passing.

[Amitpatil215]

Closing this PR, already fix is in progress /pull/73571.