[roll] Roll fuchsia [power][broker] Use runner in integration tests

* Use more granular timing, rather than immediately returning from
  SetLevel, which allows us to verify the changes triggered by current
  level changes occur only after the return.
* Retain the previous level_control versions of the test and mark them
  with a TODO to be removed after level_control is removed. The changes
  to the tests can be seen by comparing Base to Patchset 7.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1225706
Original-Revision: 03f73420fdf4dc2391090daa5964cf4b75c25026
GitOrigin-RevId: c280b3ae2d70258e65cd92387c6a255b84a207e6
Change-Id: I936bb2b9baa6dca8901776d6de8992b7bff88630
diff --git a/stem b/stem
index fc70308..e203345 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="4b58148388226a564aa869df51632fe69dfb6603"/>
+             revision="03f73420fdf4dc2391090daa5964cf4b75c25026"/>
   </projects>
   <hooks>
     <hook name="install-environment"