Fix the stage of ios_app_with_watch_companion (#54893)

diff --git a/dev/devicelab/manifest.yaml b/dev/devicelab/manifest.yaml
index 26c685b..0cc543d 100644
--- a/dev/devicelab/manifest.yaml
+++ b/dev/devicelab/manifest.yaml
@@ -642,7 +642,7 @@
   ios_app_with_watch_companion:
     description: >
       Checks that an iOS app with a watchOS companion can be build for physical and simulated devices.
-    stage: devicelab
+    stage: devicelab_ios
     required_agent_capabilities: ["mac/ios"]
     flaky: true