refactor(iOS, Fabric): move updateFormSheetPresentationStyle to updateProps (#2952)

## Description

Previously, `updateFormSheetPresentationStyle` was called from
`finalizeUpdates` every time it was called, which would run many times
when the sheet was being dragged. This impacted performance and was the
cause of the bug which was fixed in
#2935 by
introducing a flag for setting initial detent. Now, we are checking
`updateMask` in `finalizeUpdates` method. If the props have changed, we
call `updateFormSheetPresentationStyle`. We don't need the flag anymore
so I removed it as well.

Thanks to @lodev09 for [reporting the problem and suggesting possible
solution](#2935 (comment)).

## Changes

- remove `_sheetHasInitialDetentSet`
- check if props have changed using `updateMask` before calling
`updateFormSheetPresentationStyle`

## Test code and steps to reproduce

Run formSheet-related test screens in the example app, such as
`Test2543`, `TestFormSheet` (you can change `sheetInitialDetent` in the
file and save to see the update), `Test2877`.

## Checklist

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

Author: kligarski

ios/RNSScreen.mm

@@ -966,7 +966,7 @@ - (void)sheetPresentationControllerDidChangeSelectedDetentIdentifier:
  * Updates settings for sheet presentation controller.
  * Note that this method should not be called inside `stackPresentation` setter, because on Paper we don't have
  * guarantee that values of all related props had been updated earlier. It should be invoked from `didSetProps`.
- * On Fabric we have control over prop-setting process but it might be reasonable to run it from `finalizeUpdates`.
+ * On Fabric we run it from `finalizeUpdates` if props have changed.
  */
 - (void)updateFormSheetPresentationStyle
 {
@@ -1335,8 +1335,10 @@ - (void)finalizeUpdates:(RNComponentViewUpdateMask)updateMask
 {
   [super finalizeUpdates:updateMask];
 #if !TARGET_OS_TV && !TARGET_OS_VISION
-  [self updateFormSheetPresentationStyle];
-#endif // !TARGET_OS_TV
+  if (updateMask & RNComponentViewUpdateMaskProps) {
+    [self updateFormSheetPresentationStyle];
+  }
+#endif // !TARGET_OS_TV && !TARGET_OS_VISION
 }
 
 #pragma mark - Paper specific