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[CP-beta]Do not rely on Leader/Follower to position DropdownMenu menu (#159436)

This pull request is created by [automatic cherry pick
workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request)
Please fill in the form below, and a flutter domain expert will evaluate
this cherry pick request.

### Issue Link:
What is the link to the issue this cherry-pick is addressing?

https://github.com/flutter/flutter/issues/157916 and
https://github.com/flutter/flutter/issues/158924

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter
developers. See [best
practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md)
for examples

Restore the previous dropdown menu positioning logic.

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot
ship an iOS app)? Does it impact development (ex. flutter doctor crashes
when Android Studio is installed), or the shipping production app (the
app crashes on launch)

DropdownMenu menu is misplaced and can be fully or partially hidden.
See
https://github.com/flutter/flutter/pull/158930#issuecomment-2492120497
for more context.

### Workaround:
Is there a workaround for this issue?

No

### Risk:
What is the risk level of this cherry-pick?

  - [x] Low
  - [ ] Medium
  - [ ] High

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

  - [x] Yes
  - [ ] No

### Validation Steps:
What are the steps to validate that this fix works?

< Replace with validation steps here >

Co-authored-by: Bruno Leroux <bruno.leroux@gmail.com>