Stop emitting deprecated onTextInput events (#44479)

Summary:
Pull Request resolved: #44479

TextInputs' onTextInput callback was removed way back in React Native 0.62 with 3f7e0a2 , but remnants of the implementation exists.

We first have to remove the event emitting in native code, and can land the full removal separately in D57092733, once there's no older client references remaining to this event.

Changelog: [General][Removed] Remove deprecated onTextInput callback

Reviewed By: cipolleschi

Differential Revision: D57092734

fbshipit-source-id: 5b0beee3d55b70717216fe8ceaf52444540f5adc

packages/react-native/Libraries/Text/TextInput/RCTBaseTextInputView.mm

@@ -493,26 +493,13 @@ - (NSString *)textInputShouldChangeText:(NSString *)text inRange:(NSRange)range
     }
   }
 
-  NSString *previousText = [backedTextInputView.attributedText.string copy] ?: @"";
-
   if (range.location + range.length > backedTextInputView.attributedText.string.length) {
     _predictedText = backedTextInputView.attributedText.string;
   } else if (text != nil) {
     _predictedText = [backedTextInputView.attributedText.string stringByReplacingCharactersInRange:range
                                                                                         withString:text];
   }
 
-  if (_onTextInput) {
-    _onTextInput(@{
-      // We copy the string here because if it's a mutable string it may get released before we stop using it on a
-      // different thread, causing a crash.
-      @"text" : [text copy],
-      @"previousText" : previousText,
-      @"range" : @{@"start" : @(range.location), @"end" : @(range.location + range.length)},
-      @"eventCount" : @(_nativeEventCount),
-    });
-  }
-
   return text; // Accepting the change.
 }
 

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactTextInputManager.java

@@ -1062,17 +1062,12 @@ public void onTextChanged(CharSequence s, int start, int before, int count) {
       }
 
       // The event that contains the event counter and updates it must be sent first.
-      // TODO: t7936714 merge these events
       mEventDispatcher.dispatchEvent(
           new ReactTextChangedEvent(
               mSurfaceId,
               mEditText.getId(),
               s.toString(),
               mEditText.incrementAndGetEventCounter()));
-
-      mEventDispatcher.dispatchEvent(
-          new ReactTextInputEvent(
-              mSurfaceId, mEditText.getId(), newText, oldText, start, start + before));
     }
 
     @Override