Remove Server.identity from FSPG GA API (#15204)

Author: xunsun-commits

specification/postgresql/resource-manager/Microsoft.DBforPostgreSQL/preview/2021-06-01-preview/postgresql.json

@@ -1482,10 +1482,6 @@
     },
     "Server": {
       "properties": {
-        "identity": {
-          "$ref": "../../../../../common-types/resource-management/v1/types.json#/definitions/Identity",
-          "description": "The Azure Active Directory identity of the server."
-        },
         "sku": {
           "$ref": "#/definitions/Sku",
           "description": "The SKU (pricing tier) of the server."

specification/postgresql/resource-manager/Microsoft.DBforPostgreSQL/stable/2021-06-01/postgresql.json

@@ -1482,10 +1482,6 @@
     },
     "Server": {
       "properties": {
-        "identity": {
-          "$ref": "../../../../../common-types/resource-management/v1/types.json#/definitions/Identity",
-          "description": "The Azure Active Directory identity of the server."
-        },
         "sku": {
           "$ref": "#/definitions/Sku",
           "description": "The SKU (pricing tier) of the server."