Return early when the caller doesn't have any permission.

We don't need to query app search db if caller doesn't have any permission.

Change-Id: I92eeca29b1b5d44592001434eb252a4b884ea7bc
Flag: android.app.appfunctions.flags.enable_app_function_manager
Test: Verified by running locally. Will add CTS in next cl.
Bug: 360864791
diff --git a/services/appfunctions/java/com/android/server/appfunctions/CallerValidatorImpl.java b/services/appfunctions/java/com/android/server/appfunctions/CallerValidatorImpl.java
index c4ccdd8..94a63b4 100644
--- a/services/appfunctions/java/com/android/server/appfunctions/CallerValidatorImpl.java
+++ b/services/appfunctions/java/com/android/server/appfunctions/CallerValidatorImpl.java
@@ -112,6 +112,10 @@
                 mContext.checkPermission(Manifest.permission.EXECUTE_APP_FUNCTIONS, pid, uid)
                         == PackageManager.PERMISSION_GRANTED;
 
+        if (!hasExecutionPermission) {
+            return AndroidFuture.completedFuture(false);
+        }
+
         final long token = Binder.clearCallingIdentity();
         try {
             FutureAppSearchSession futureAppSearchSession =