Launch ForgotPasswordActivity in a new task.

This way the notificaiton about locked profile can function as
expected. Prior to this change ForgotPasswordActivity was launched
in the same task as initial profile credential confirmation. As a
result, when ForgotPasswordActivity was in the foreground, the
notification tap won't do anything since a task for
CONFIRM_DEVICE_CREDENTIAL_WITH_USER was already in the
foreground.

Bug: 157554361
Test: manual, with TestDPC
Change-Id: Ifc9d8e1fb8658c3f22926d7fa35da1e60eadb3db

src/com/android/settings/password/ConfirmDeviceCredentialBaseFragment.java

@@ -152,6 +152,7 @@ public abstract class ConfirmDeviceCredentialBaseFragment extends InstrumentedFr
             mForgotButton.setOnClickListener(v -> {
                 final Intent intent = new Intent();
                 intent.setClassName(SETTINGS_PACKAGE_NAME, ForgotPasswordActivity.class.getName());
+                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                 intent.putExtra(Intent.EXTRA_USER_ID, mUserId);
                 getActivity().startActivity(intent);
                 getActivity().finish();