Remove getRuntimeExecutor() from ReactContext (#44102)

Summary:
Pull Request resolved: #44102

Remove `getRuntimeExecutor()` from ReactContext since now it can be accessed through BridgelessCatalystInstance.getRuntimeExecutor() directly

Changelog:
[Android][Removed] - Remove getRuntimeExecutor() from ReactContext since now it can be accessed through BridgelessCatalystInstance in Bridgeless mode

Reviewed By: RSNara

Differential Revision: D56151365

fbshipit-source-id: 42bb6a6a3d729339cfb83ffdd3f7cbec314b687a

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/bridge/ReactContext.java

@@ -27,8 +27,6 @@
 import com.facebook.react.common.LifecycleState;
 import com.facebook.react.common.ReactConstants;
 import com.facebook.react.common.annotations.DeprecatedInNewArchitecture;
-import com.facebook.react.common.annotations.FrameworkAPI;
-import com.facebook.react.common.annotations.UnstableReactNativeAPI;
 import java.lang.ref.WeakReference;
 import java.util.Collection;
 import java.util.concurrent.CopyOnWriteArraySet;
@@ -212,20 +210,6 @@ public <T extends NativeModule> T getNativeModule(Class<T> nativeModuleInterface
     return mCatalystInstance.getNativeModule(nativeModuleInterface);
   }
 
-  /**
-   * @return the RuntimeExecutor, a thread-safe handler for accessing the runtime.
-   * @experimental
-   */
-  @Nullable
-  @FrameworkAPI
-  @UnstableReactNativeAPI
-  public RuntimeExecutor getRuntimeExecutor() {
-    if (mCatalystInstance == null) {
-      raiseCatalystInstanceMissingException();
-    }
-    return mCatalystInstance.getRuntimeExecutor();
-  }
-
   /**
    * Calls RCTDeviceEventEmitter.emit to JavaScript, with given event name and an optional list of
    * arguments.

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/runtime/BridgelessReactContext.java

@@ -19,7 +19,6 @@
 import com.facebook.react.bridge.NativeArray;
 import com.facebook.react.bridge.NativeModule;
 import com.facebook.react.bridge.ReactApplicationContext;
-import com.facebook.react.bridge.RuntimeExecutor;
 import com.facebook.react.bridge.UIManager;
 import com.facebook.react.bridge.WritableNativeArray;
 import com.facebook.react.common.annotations.FrameworkAPI;
@@ -158,17 +157,6 @@ public Collection<NativeModule> getNativeModules() {
     return mReactHost.getNativeModule(nativeModuleInterface);
   }
 
-  /**
-   * @return the RuntimeExecutor, a thread-safe handler for accessing the runtime. If the runtime is
-   *     not initialized yet, it will return null.
-   */
-  @Override
-  @FrameworkAPI
-  @UnstableReactNativeAPI
-  public @Nullable RuntimeExecutor getRuntimeExecutor() {
-    return mReactHost.getRuntimeExecutor();
-  }
-
   @Override
   @FrameworkAPI
   @UnstableReactNativeAPI