[roll] Roll fuchsia [wlan][tests] Move realm-factory component and FIDL

This moves src/connectivity/wlan/testing/hw-sim/testing/realm-factory ->
src/connectivity/wlan/tests/helpers/realm-factory, and moves the fidl
directory to be a subdirectory of realm-factory.

This is part of a reorganization of the directory structure for new WLAN
integration tests.

Test: fx test simulate-scan
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/967955
Original-Revision: 01fa934734629a403a8ebfe12deeb427f9dbf6cc
GitOrigin-RevId: 62cb8e3898dba115bc18c32c331ed39b0277316d
Change-Id: I6911db95cf3266ab2f744713414c57e96fdaaaea
diff --git a/stem b/stem
index 043cd15..662bd36 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="8a44889ebb72ec7fc929e51898c18e1ab5ef6b89"/>
+             revision="01fa934734629a403a8ebfe12deeb427f9dbf6cc"/>
   </projects>
   <hooks>
     <hook name="install-environment"