[Synapse] azure-synapse post deprecation (#38315)

sdk/synapse/azure-synapse/pyproject.toml

@@ -1,3 +1,4 @@
 [tool.azure-sdk-build]
 pylint = false
 sphinx = false
+ci_enabled = false

sdk/synapse/ci.yml

@@ -39,7 +39,5 @@ extends:
       safeName: azuresynapsemonitoring
     - name: azure-synapse-managedprivateendpoints
       safeName: azuresynapsemanagedprivateendpoints
-    - name: azure-synapse
-      safeName: azuresynapse
     - name: azure-mgmt-synapse
       safeName: azuremgmtsynapse