CodeGen from PR 15577 in Azure/azure-rest-api-specs

Swagger changes for MFA work (#15577)

* Baseline changes for API version 2021-07-01

* Made the new changes related to API version 2021-07-01

* Fixing Lintdiff failure

* resolved PR comments

* Fixing validation failures

* Fix the validation failures

* Made lintdiff failures

* Resolved PR comments

* Fixing validation failures

* Resolved PR comments

Co-authored-by: Madhumanti Dey <madhude@microsoft.com>

Author: SDKAuto