fix(iOS): allow to interactively swipe down the modal (#51483)

Summary:
This PR allows to interactively close the modal using the swipe down gesture.

It fixes 5 year old issue: https://github.com/facebook/react-native/issues/29319

In short it removes `modalInPresentation` which according to the documentation causes: "UIKit ignores events outside the view controller’s bounds and **prevents the interactive dismissal of the view controller while it is onscreen.**".

It also adds another delegate event to call onRequestClose whenever modal is closed by gesture.

https://github.com/user-attachments/assets/8849ecba-f762-47ec-a28b-b41c1991a882

## Changelog:

[IOS] [ADDED] - Allow to interactively swipe down the modal.
Add allowSwipeDismissal prop.

Pull Request resolved: https://github.com/facebook/react-native/pull/51483

Test Plan: Test if swiping down the modal calls onRequestClose

Reviewed By: rshest

Differential Revision: D75125438

Pulled By: javache

fbshipit-source-id: d4f2c8b59447680f405b725d0809573a937f97cf