CodeGen from PR 19735 in Azure/azure-rest-api-specs

Fix a couple issues with existing swaggers (#19735)

* Change to lowercase for the TestNotificationDetailsResponse contract

* Revert "Change to lowercase for the TestNotificationDetailsResponse contract"

This reverts commit 5d122560c6516ed4e327713a4f168f3c048d4ee7.

* Task 14946056: Fix the Swagger, need to return response schema for POST API even API does not have a response

* Need to fix examples

* Pretty check

* State to state

Co-authored-by: Thomas Pham <[email protected]>