Add FLAG_ACTIVITY_NEW_TASK when starting UI-based tether provisioning.

Bug: 72223006
Bug: 72219677
Test: manual
Change-Id: Iba7a58729903207b2ec75524fc1ef4c404f0b6a3

services/core/java/com/android/server/connectivity/Tethering.java

@@ -495,6 +495,7 @@ public class Tethering extends BaseNetworkObserver {
         Intent intent = new Intent(Settings.ACTION_TETHER_PROVISIONING);
         intent.putExtra(ConnectivityManager.EXTRA_ADD_TETHER_TYPE, type);
         intent.putExtra(ConnectivityManager.EXTRA_PROVISION_CALLBACK, receiver);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         final long ident = Binder.clearCallingIdentity();
         try {
             mContext.startActivityAsUser(intent, UserHandle.CURRENT);