[Core] servicemanagement-legacy post deprecation (Azure#38319)

Author: swathipil

sdk/core/azure-servicemanagement-legacy/pyproject.toml

@@ -4,4 +4,5 @@ type_check_samples = false
 verifytypes = false
 pyright = false
 pylint = false
-black = false
+black = false
+ci_enabled = false

sdk/core/ci.yml

@@ -55,5 +55,3 @@ extends:
       safeName: azurecoreexperimental
     - name: corehttp
       safeName: corehttp
-    - name: azure-servicemanagement-legacy
-      safeName: azureservicemanagementlegacy