Skip image-paste pasteboard probe in TextInput to avoid main-thread hangs

Summary:
WARNING: Generated by Autopilot (alpha) — review carefully, verify the underlying claim before accepting.
Agent: [React Native Agent (Bugs)](https://www.internalfb.com/autopilot/marketplace?agent=1645742253726459) | Trajectory: https://www.internalfb.com/intern/devai/devmate/inspector/dea80a9f-a635-4ecc-874d-33f0741108ca/ | SC job: https://www.internalfb.com/intern/sandcastle/instance/9007202303535554/

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When the app returns to the foreground with a TextInput focused, UIKit refreshes the keyboard's paste support. To decide whether the field supports image paste, UIKit calls `-[RCTUITextView canPerformAction:withSender:]` with `paste:`. `super` then synchronously queries the system pasteboard over XPC on the main thread. If the pasteboard service is slow to reply, the main thread blocks long enough for the system to terminate the app.

This diff overrides `supportsImagePaste` to return `NO` in `RCTUITextView` and `RCTUITextField`, so UIKit skips that pasteboard query. TextInput only accepts text, so no image paste capability is lost. `canPerformAction:` and `paste:` are unchanged, so the edit menu and text paste work as before.

Changelog:
[iOS][Fixed] - Avoid a synchronous main-thread pasteboard query (and possible app hang) when a focused TextInput's keyboard becomes active on app foreground

Reviewed By: cortinico

Differential Revision: D125922446

Author: Autopilot Bot

packages/react-native/Libraries/Text/TextInput/Multiline/RCTUITextView.mm

@@ -348,6 +348,15 @@ - (BOOL)canPerformAction:(SEL)action withSender:(id)sender
   return [super canPerformAction:action withSender:sender];
 }
 
+// UIKit queries this when the keyboard becomes active, including when the app returns to the
+// foreground. The default implementation calls `canPerformAction:` with `paste:`, which
+// synchronously queries the system pasteboard on the main thread and can hang the app. TextInput
+// only accepts text, so opt out of image paste; text paste is unaffected.
+- (BOOL)supportsImagePaste
+{
+  return NO;
+}
+
 - (void)buildMenuWithBuilder:(id<UIMenuBuilder>)builder
 {
 #if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 170000 && !TARGET_OS_TV

packages/react-native/Libraries/Text/TextInput/Singleline/RCTUITextField.mm

@@ -196,6 +196,15 @@ - (BOOL)canPerformAction:(SEL)action withSender:(id)sender
   return [super canPerformAction:action withSender:sender];
 }
 
+// UIKit queries this when the keyboard becomes active, including when the app returns to the
+// foreground. The default implementation calls `canPerformAction:` with `paste:`, which
+// synchronously queries the system pasteboard on the main thread and can hang the app. TextInput
+// only accepts text, so opt out of image paste; text paste is unaffected.
+- (BOOL)supportsImagePaste
+{
+  return NO;
+}
+
 - (void)buildMenuWithBuilder:(id<UIMenuBuilder>)builder
 {
 #if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 170000