### Issue Link:
https://github.com/flutter/flutter/issues/148867

Cherry-picking https://github.com/flutter/flutter/pull/147390

### Changelog Description:
Fixes a focus issue that causes TextFields to not function after cupertino back swipes

### Impact Description:
iOS, macos, iOS web, macos web app that uses TextField

### Workaround:
disable cupertino back swipe

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

TextField should not be broken after a cupertino back swipe