doc(android): Improve documentation of onRequestPermissionResult

[GitToTheHub]

Platforms affected

Android

Motivation and Context

It was not documented, that grantResults can be empty when the permissions request interaction with the user was interrupted and that onRequestPermissionResult is a method from Android.

• Mention that it is a forwarded Android method
• Add Android documentation link for onRequestPermissionsResult
• Handle and document grandResult.length == 0, which can occur, if the request interaction was interrupted
• Document code in onRequestPermissionResult and small refactoring

I changed this in dev, 12.x-2025.01, 12.x, 11.x

Testing

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary