Revert D65556000

Summary:
Reverts facebook#47468

Changelog: [Internal]

Differential Revision: D66030953

packages/react-native/React/Fabric/Mounting/ComponentViews/ScrollView/RCTScrollViewComponentView.mm

@@ -903,8 +903,6 @@ - (void)scrollToOffset:(CGPoint)offset animated:(BOOL)animated
     // When not animated, the expected workflow in ``scrollViewDidEndScrollingAnimation`` after scrolling is not going
     // to get triggered. We will need to manually execute here.
     [self _handleFinishedScrolling:_scrollView];
-  } else if (_eventEmitter) {
-    static_cast<const ScrollViewEventEmitter &>(*_eventEmitter).onMomentumScrollBegin([self _scrollViewMetrics]);
   }
 }
 

packages/react-native/React/Views/ScrollView/RCTScrollView.m

@@ -600,9 +600,6 @@ - (void)scrollToOffset:(CGPoint)offset animated:(BOOL)animated
       offset = CGPointMake(x, y);
     }
     [_scrollView setContentOffset:offset animated:animated];
-    if (animated) {
-      [self sendScrollEventWithName:@"onMomentumScrollBegin" scrollView:_scrollView userData:nil];
-    }
   }
 }
 
@@ -625,9 +622,6 @@ - (void)scrollToEnd:(BOOL)animated
     // Ensure at least one scroll event will fire
     _allowNextScrollNoMatterWhat = YES;
     [_scrollView setContentOffset:offset animated:animated];
-    if (animated) {
-      [self sendScrollEventWithName:@"onMomentumScrollBegin" scrollView:_scrollView userData:nil];
-    }
   }
 }
 

packages/rn-tester/js/examples/ScrollView/ScrollViewExample.js

@@ -15,7 +15,7 @@ import RNTesterText from '../../components/RNTesterText';
 import ScrollViewPressableStickyHeaderExample from './ScrollViewPressableStickyHeaderExample';
 import nullthrows from 'nullthrows';
 import * as React from 'react';
-import {useCallback, useRef, useState} from 'react';
+import {useCallback, useState} from 'react';
 import {
   Platform,
   RefreshControl,
@@ -855,21 +855,11 @@ const OnScrollOptions = () => {
 };
 
 const OnMomentumScroll = () => {
-  const ref = useRef<?React.ElementRef<typeof ScrollView>>(null);
   const [scroll, setScroll] = useState('none');
   return (
     <View>
       <RNTesterText>Scroll State: {scroll}</RNTesterText>
-      <Button
-        label="scrollTo top (animated)"
-        onPress={() => ref.current?.scrollTo({x: 0, y: 0, animated: true})}
-      />
-      <Button
-        label="scrollTo top (not animated)"
-        onPress={() => ref.current?.scrollTo({x: 0, y: 0, animated: false})}
-      />
       <ScrollView
-        ref={ref}
         style={[styles.scrollView, {height: 200}]}
         onMomentumScrollBegin={() => setScroll('onMomentumScrollBegin')}
         onMomentumScrollEnd={() => setScroll('onMomentumScrollEnd')}