[Hub Generated] Review request for Microsoft.ContainerInstance to add version stable/2021-10-01 (#19508)

* Fix workspacekey and identity on Get

* Update Get for dnsNameLabelReusePolicy, fix example

* Add secret identifier to properties

* Add missing ID in usage

* Fix autoGeneratedDomainNameLabelScope and dnsNameLabelReusePolicy mixup

* Remove secret id for env.val

* Add missing start return code

* Improve response message

* Integrate Rubin's changes to fix linting error

* Add Abdel's changes for missing operation

* Remove duplicate RG name parameter

* Run prettier

* Add missing description

Author: joseph-porter