CodeGen from PR 21241 in Azure/azure-rest-api-specs

Migrate to net track2 for some resource-manager readmes batch 3 (#21241)

* migrate to track 2

* revert configs for machinelearning and managementgroups

* resolve Go SDK automation failure

Co-authored-by: Chenjie Shi <tadelesh.shi@live.cn>

schemas/2022-03-01/Microsoft.RecoveryServices.Backup.json

@@ -1021,7 +1021,8 @@
             {
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
-          ]
+          ],
+          "description": "Type of backup policy type."
         },
         "retentionPolicy": {
           "oneOf": [