Fix declarative blur not working (#56223)

Summary:
Pull Request resolved: #56223

Calling blur() on a ref works now. Failed before bc we did not become first responder when we were focused, so resign first responder would fail and no onBlur() event would be generated.

Changelog: [Internal]

Reviewed By: jorge-cab

Differential Revision: D98006567

fbshipit-source-id: 005c4b370b0c68ffb5e24604ad7b26e6a069729d

Author: joevilches

packages/react-native/React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.mm

@@ -1777,14 +1777,14 @@ - (void)didUpdateFocusInContext:(UIFocusUpdateContext *)context
     return;
   }
 
+  // Do not resignFirstRespodner if we lost focus, let whoever took focus
+  // becomeFirstResponder thereby resigning for us. If we resign here,
+  // first responder will be assigned to some ancestor view and they
+  // can temporarily call onFocus/onBlur
   if (context.nextFocusedView == self) {
-    if (_eventEmitter) {
-      _eventEmitter->onFocus();
-    }
-  } else {
-    if (_eventEmitter) {
-      _eventEmitter->onBlur();
-    }
+    [self becomeFirstResponder];
+  } else if (context.previouslyFocusedView == self && context.nextFocusedView == nil) {
+    [self resignFirstResponder];
   }
 
   [super didUpdateFocusInContext:context withAnimationCoordinator:coordinator];