fix: added showSoftInputFocus handling for iOS new architecture (#45298)

Summary:
Fixes: https://github.com/facebook/react-native/issues/45297

In iOS New Architecture When we are passing `showSoftInputOnFocus` prop to TextInput as false it should prevent soft keyboard from showing.
Here, the problem is in Fabric counterpart of TextInput, there we are not handling `showSoftInputOnFocus` props anywhere.

## Changelog:

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[iOS] [ADDED] - Added handling of `showSoftInputOnFocus` props for new arch.

For more details, see:
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Pull Request resolved: https://github.com/facebook/react-native/pull/45298

Test Plan:
Below is the screen recording of fix made.

https://github.com/facebook/react-native/assets/85783070/de94877a-f684-4f8d-9ec4-a16f9755663e

Reviewed By: cipolleschi

Differential Revision: D59447432

Pulled By: dmytrorykun

fbshipit-source-id: 240854bc1101bdf0b04d7978c557215ff3f8a449

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

@@ -191,6 +191,10 @@ static NSSet<NSNumber *> *returnKeyTypesSet;
         RCTUITextSmartInsertDeleteTypeFromOptionalBool(newTextInputProps.traits.smartInsertDelete);
   }
 
+  if (newTextInputProps.traits.showSoftInputOnFocus != oldTextInputProps.traits.showSoftInputOnFocus) {
+    [self _setShowSoftInputOnFocus:newTextInputProps.traits.showSoftInputOnFocus];
+  }
+
   // Traits `blurOnSubmit`, `clearTextOnFocus`, and `selectTextOnFocus` were omitted intentionally here
   // because they are being checked on-demand.
 
@@ -658,6 +662,23 @@ static NSSet<NSNumber *> *returnKeyTypesSet;
   [self addSubview:_backedTextInputView];
 }
 
+- (void)_setShowSoftInputOnFocus:(BOOL)showSoftInputOnFocus
+{
+  if (showSoftInputOnFocus) {
+    // Resets to default keyboard.
+    _backedTextInputView.inputView = nil;
+
+    // Without the call to reloadInputViews, the keyboard will not change until the textInput field (the first
+    // responder) loses and regains focus.
+    if (_backedTextInputView.isFirstResponder) {
+      [_backedTextInputView reloadInputViews];
+    }
+  } else {
+    // Hides keyboard, but keeps blinking cursor.
+    _backedTextInputView.inputView = [UIView new];
+  }
+}
+
 - (BOOL)_textOf:(NSAttributedString *)newText equals:(NSAttributedString *)oldText
 {
   // When the dictation is running we can't update the attributed text on the backed up text view