[Scheduler] mgmt-scheduler post deprecation (#38320)

sdk/scheduler/azure-mgmt-scheduler/pyproject.toml

@@ -1,2 +1,3 @@
 [tool.azure-sdk-build]
 breaking = false
+ci_enabled = false

sdk/scheduler/ci.yml

@@ -28,6 +28,3 @@ extends:
   parameters:
     ServiceDirectory: scheduler
     TestProxy: true
-    Artifacts:
-    - name: azure-mgmt-scheduler
-      safeName: azuremgmtscheduler