fix: scroll the cursor into view when focus (#46411)

Summary:
Currently in iOS, when focusing the multiline text input, the cursor is not automatically scrolled into view if it is out of view. This PR adds the small util to scroll the cursor into view when the text input focuses. This doesn't happen in Android due to [this](defb0bd137/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactEditText.java (L360))

Original issue: https://github.com/Expensify/App/issues/48122
Original proposal: https://github.com/Expensify/App/issues/48122#issuecomment-2320769418

## Changelog:

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[IOS] [ADDED] - Scroll the cursor into view when text input is focused

Pull Request resolved: https://github.com/facebook/react-native/pull/46411

Test Plan:
Code to reproduce in rn-tester
```
const TextInputWithFocusButton = () => {
  const inputToFocusRef = React.useRef<React.ElementRef<typeof TextInput> | null>(null);
  return (
    <View>
      <ExampleTextInput
        ref={inputToFocusRef}
        placeholder="height increases with content"
        defaultValue="React Native enables you to build world-class application experiences on native platforms using a consistent developer experience based on JavaScript and React. The focus of React Native is on developer efficiency across all the platforms you care about - learn once, write anywhere. Facebook uses React Native in multiple production apps and will continue investing in React Native."
        multiline={true}
        enablesReturnKeyAutomatically={true}
        returnKeyType="go"
        style={[styles.multiline, styles.multilineExpandable]}
      />
      <Button title="Focus" onPress={() => {
        inputToFocusRef.current?.focus();
      }} />
    </View>
  );
};
```

Steps:
- Move the cursor of the input to end of the input text
- Scroll up the input
- Blur the input
- Click on `Focus` button to re-focus the input

Note that before this fix, the cursor is not scrolled into view

- In iOS

<table>
<tr>
<th>Before</th>
<th>After</th>
</tr>
<tr>
<td>

https://github.com/user-attachments/assets/de589cbf-158c-4e28-81d6-8412bf05ab23

</td>
<td>

https://github.com/user-attachments/assets/81c571f9-653b-49a5-9ecb-6eeaa2c54ec7

</td>
</tr>
</table>

Reviewed By: sammy-SC

Differential Revision: D62847985

Pulled By: cipolleschi

fbshipit-source-id: c0367a7fc0a7a16b30c4538e59f42d971d959357

packages/react-native/React/Fabric/Mounting/ComponentViews/TextInput/RCTTextInputComponentView.mm

@@ -114,6 +114,7 @@ static NSSet<NSNumber *> *returnKeyTypesSet;
     const auto &props = static_cast<const TextInputProps &>(*_props);
     if (props.autoFocus) {
       [_backedTextInputView becomeFirstResponder];
+      [self scrollCursorIntoView];
     }
     _didMoveToWindow = YES;
     [self initializeReturnKeyType];
@@ -495,6 +496,8 @@ static NSSet<NSNumber *> *returnKeyTypesSet;
     [_backedTextInputView selectAll:nil];
     [self textInputDidChangeSelection];
   }
+
+  [self scrollCursorIntoView];
 }
 
 - (void)blur
@@ -729,6 +732,16 @@ static NSSet<NSNumber *> *returnKeyTypesSet;
   }
 }
 
+- (void)scrollCursorIntoView
+{
+  UITextRange *selectedRange = _backedTextInputView.selectedTextRange;
+  if (selectedRange.empty) {
+    NSInteger offsetStart = [_backedTextInputView offsetFromPosition:_backedTextInputView.beginningOfDocument
+                                                          toPosition:selectedRange.start];
+    [_backedTextInputView scrollRangeToVisible:NSMakeRange(offsetStart, 0)];
+  }
+}
+
 - (void)_setMultiline:(BOOL)multiline
 {
   [_backedTextInputView removeFromSuperview];

packages/rn-tester/js/examples/TextInput/TextInputExample.ios.js

@@ -28,6 +28,7 @@ const {
   Switch,
   Text,
   View,
+  TextInput,
 } = require('react-native');
 
 class WithLabel extends React.Component<$FlowFixMeProps> {
@@ -263,6 +264,31 @@ class AutogrowingTextInputExample extends React.Component<
   }
 }
 
+const TextInputWithFocusButton = () => {
+  const inputToFocusRef = React.useRef<React.ElementRef<
+    typeof TextInput,
+  > | null>(null);
+  return (
+    <View>
+      <ExampleTextInput
+        ref={inputToFocusRef}
+        placeholder="height increases with content"
+        defaultValue="React Native enables you to build world-class application experiences on native platforms using a consistent developer experience based on JavaScript and React. The focus of React Native is on developer efficiency across all the platforms you care about - learn once, write anywhere. Facebook uses React Native in multiple production apps and will continue investing in React Native."
+        multiline={true}
+        enablesReturnKeyAutomatically={true}
+        returnKeyType="go"
+        style={[styles.multiline, styles.multilineExpandable]}
+      />
+      <Button
+        title="Focus"
+        onPress={() => {
+          inputToFocusRef.current?.focus();
+        }}
+      />
+    </View>
+  );
+};
+
 const styles = StyleSheet.create({
   multiline: {
     height: 50,
@@ -895,6 +921,12 @@ const textInputExamples: Array<RNTesterModuleExample> = [
       );
     },
   },
+  {
+    title: 'Auto scroll cursor into view when focusing',
+    render: function (): React.Node {
+      return <TextInputWithFocusButton />;
+    },
+  },
   {
     title: 'Line Break Mode',
     render: function (): React.Node {