fix(iOS, Stack v4): crash on modal dismiss gesture with Pressable (#3133)

## Description

Removes manual gesture cancel for modal dismiss on Fabric.

Fixes
software-mansion/react-native-screens-labs#360.

The logic for cancelling gesture when modal will be dismissed has been
added in
#1485.

On iOS 26 + Fabric, this code causes a crash (gesture update comes after
resetting `_activeTouches` array, inconsistency is detected).

The logic seems redundant now as the case described in the comment works
without it on Fabric. I suspect this might've been patched in [this
commit in
`react-native`](facebook/react-native@379d9d4).

On Paper, it is still necesssary. During testing, I noticed another bug
- you can "catch" another pressable during animation. This however
happens only on Paper.

| Paper | Fabric |
| --- | --- |
| <video
src="https://github.com/user-attachments/assets/a29d7a59-74b1-4ae8-8250-36bb1fafd362"
/> | <video
src="https://github.com/user-attachments/assets/b264caaa-91ff-433e-8618-6d946b6370ce"
/>

There are more places where we force the reset but I don't think that
removing them all now is a good idea. We can go one-by-one, when any
problems emerge.

## Changes

- remove `presentationControllerWillDismiss` override on Fabric

## Screenshots / GIFs

| before | after |
| --- | --- |
| <video
src="https://github.com/user-attachments/assets/bb6ad158-04af-4ca2-a0c7-4cd2fae86de9"
/> | <video
src="https://github.com/user-attachments/assets/aefadd8e-6106-43b5-bf8f-dfd8a148c617"
/> |

## Test code and steps to reproduce

Run `Test3111` (that PR hasn't been merged at the moment) or `Test780`

## Checklist

- [x] Included code example that can be used to test this change
- [x] Ensured that CI passes

Author: kligarski

ios/RNSScreen.mm

@@ -730,10 +730,11 @@ - (void)notifyTransitionProgress:(double)progress closing:(BOOL)closing goingFor
 #endif
 }
 
+#if !RCT_NEW_ARCH_ENABLED
 - (void)presentationControllerWillDismiss:(UIPresentationController *)presentationController
 {
-  // We need to call both "cancel" and "reset" here because RN's gesture recognizer
-  // does not handle the scenario when it gets cancelled by other top
+  // On Paper, we need to call both "cancel" and "reset" here because RN's gesture
+  // recognizer does not handle the scenario when it gets cancelled by other top
   // level gesture recognizer. In this case by the modal dismiss gesture.
   // Because of that, at the moment when this method gets called the React's
   // gesture recognizer is already in FAILED state but cancel events never gets
@@ -742,14 +743,10 @@ - (void)presentationControllerWillDismiss:(UIPresentationController *)presentati
   // pulling down starting at some touchable item. Without "reset" the touchable
   // will never go back from highlighted state even when the modal start sliding
   // down.
-#ifdef RCT_NEW_ARCH_ENABLED
-  [_touchHandler setEnabled:NO];
-  [_touchHandler setEnabled:YES];
-#else
   [_touchHandler cancel];
-#endif
   [_touchHandler reset];
 }
+#endif // !RCT_NEW_ARCH_ENABLED
 
 - (BOOL)presentationControllerShouldDismiss:(UIPresentationController *)presentationController
 {