CodeGen from PR 20467 in Azure/azure-rest-api-specs

[Hub Generated] Publish private branch 'eventListener' (#20467)

* Adds base for updating Microsoft.SignalRService from version stable/2021-10-01 to version 2022-08-01-preview

* Updates readme

* Updates API version in new specs and examples

* "ot" -> "or"

* Update swagger

* max listener count = 10
* Add custom cert and custom domain

* Add examples

* Add fina-state-via for delete

* Fix markdown format

* Rename discriminator and enum type

* Add x-ms-identifier

* Update markdown settings

* Fix 204 description

* Add 200 to custom domain PUT

* Revert adding 200 response code to put

* try fix readiness test

1. change default tire to premium
2. remove private endpoint

Author: SDKAuto