Fix breaking change azureADOnlyAuthentication property from read only… (Azure#21076)

* Fix breaking change azureADOnlyAuthentication property from read only to read, write

* Removed x-ms-mutability

Author: sparatala

specification/synapse/resource-manager/Microsoft.Synapse/preview/2021-06-01-preview/workspace.json

@@ -1495,11 +1495,7 @@
         },
         "azureADOnlyAuthentication": {
           "description": "Enable or Disable AzureADOnlyAuthentication on All Workspace subresource",
-          "type": "boolean",
-          "x-ms-mutability": [
-            "create",
-            "read"
-          ]
+          "type": "boolean"
         },
         "trustedServiceBypassEnabled": {
           "description": "Is trustedServiceBypassEnabled for the workspace",

specification/synapse/resource-manager/Microsoft.Synapse/stable/2021-06-01/workspace.json

@@ -1340,11 +1340,7 @@
         },
         "azureADOnlyAuthentication": {
           "description": "Enable or Disable AzureADOnlyAuthentication on All Workspace subresource",
-          "type": "boolean",
-          "x-ms-mutability": [
-            "create",
-            "read"
-          ]
+          "type": "boolean"
         },
         "trustedServiceBypassEnabled": {
           "description": "Is trustedServiceBypassEnabled for the workspace",