iOS: adding a few warning/enforcement for the new architecture

Summary:
In the full bridgeless, the following aren't allowed:
* using legacy view manager interop layer (won't support long term, but still needed today, so just warn)
* initializing any subclass of RCTViewManager (won't support long term, but still used by legacy interop layer)
* initializing RCTUIManager (fabric UIManager should be the only one used)

Changelog: [Internal]

Reviewed By: mdvacca

Differential Revision: D28111530

fbshipit-source-id: 4f5eab600c6c7896d51861545b7f878c25248e44

Author: fkgozali

React/Fabric/Mounting/ComponentViews/LegacyViewManagerInterop/RCTLegacyViewManagerInteropComponentView.mm

@@ -7,6 +7,7 @@
 
 #import "RCTLegacyViewManagerInteropComponentView.h"
 
+#import <React/RCTAssert.h>
 #import <React/UIView+React.h>
 #import <react/renderer/components/legacyviewmanagerinterop/LegacyViewManagerInteropComponentDescriptor.h>
 #import <react/renderer/components/legacyviewmanagerinterop/LegacyViewManagerInteropViewProps.h>
@@ -28,6 +29,8 @@ @implementation RCTLegacyViewManagerInteropComponentView {
 - (instancetype)initWithFrame:(CGRect)frame
 {
   if (self = [super initWithFrame:frame]) {
+    RCTWarnNotAllowedForNewArchitecture(
+        self, @"ViewManager with interop layer is not allowed in the new architecture.");
     static const auto defaultProps = std::make_shared<const LegacyViewManagerInteropViewProps>();
     _props = defaultProps;
     _viewsToBeMounted = [NSMutableArray new];

React/Modules/RCTUIManager.m

@@ -147,6 +147,8 @@ - (NSMapTable *)nativeIDRegistry
 
 - (void)setBridge:(RCTBridge *)bridge
 {
+  RCTEnforceNotAllowedForNewArchitecture(self, @"RCTUIManager must not be initialized for the new architecture");
+
   RCTAssert(_bridge == nil, @"Should not re-use same UIManager instance");
   _bridge = bridge;
 

React/Views/RCTViewManager.m

@@ -7,6 +7,7 @@
 
 #import "RCTViewManager.h"
 
+#import "RCTAssert.h"
 #import "RCTBorderStyle.h"
 #import "RCTBridge.h"
 #import "RCTConvert+Transform.h"
@@ -77,6 +78,12 @@ - (dispatch_queue_t)methodQueue
   return RCTGetUIManagerQueue();
 }
 
+- (void)setBridge:(RCTBridge *)bridge
+{
+  RCTWarnNotAllowedForNewArchitecture(self, @"RCTViewManager must not be initialized for the new architecture");
+  _bridge = bridge;
+}
+
 - (UIView *)view
 {
   return [RCTView new];