CodeGen from PR 11393 in Azure/azure-rest-api-specs

Adding API to support generating access token for ApplicationInsights Profiler (Azure#11393)

* Adds base for updating Microsoft.Insights from version preview/2020-10-05-preview to version 2020-10-26-preview

* Updates readme

* Updates API version in new specs and examples

* Update readme to pointing to profilerToken_API.json

* Update operations list

* Add profiler token getter

* Wire up the defintions

* Fix error: additonal property of liveToken

* Append post action

* Update api-version for example

* Fix some small issues

* Update readme for the resolving autorest check issue

* From profilertoken to profilerToken

* Ran prettier

* Appending back missing readme for 2020-10 tag

* Fix some mistakes

* Use common error response

* Tag secret with x-ms-secret

* Remove list operations

* Clean up packages

* Making 2 post operations for token

* Remove unused operations_list.json example

* Align with official master

* Resolve conflicts

* Add x-ms-secret for the token

* Update error response schema ref

* Update operation ids

* Remove unused error response