Add Unified Pipeline APIView Release

[scbedd]

This is related to #7941

This PR eliminates the need for the following standalone releases, and ensures that APIView is compliant with security needs.

• APIView UI Test Instance: Releases - Pipelines (azure.com)
• Release to APIView Staging: Releases - Pipelines (azure.com)
• APIView to Azure App Service: Releases - Pipelines (azure.com)

When queuing manually from internal, users will be prompted for a target environment prod or staging. staging enables access to #1 and #2 in the list above. prod enables #3 only.

Ready to test the actual releases.

New Stage Flow

Build and Test -> Staging (automatic) -> Production (approve required)
               -> Test UI (approve required)

[praveenkuttappan]

Looks fine. Only additional change I prefer to have is to support deployment of just the UI test instance.

Currently following are the deployment patterns.

1. APIView UI test is deployed for some testing and demo purposes (Less frequent deployment).
2. APIView stage gets auto deployed anytime a new change is merged to main branch. So staging can be run pretty much as a CI job.
3. APIView production deployment is done manually.

[scbedd]

Looks fine. Only additional change I prefer to have is to support deployment of just the UI test instance.

Currently following are the deployment patterns.

1. APIView UI test is deployed for some testing and demo purposes (Less frequent deployment).
2. APIView stage gets auto deployed anytime a new change is merged to main branch. So staging can be run pretty much as a CI job.
3. APIView production deployment is done manually.

Ok Praveen, I've made the following adjustments.

1. Staging auto publishes to staging if the build is from internal
2. Releases always flow through staging first
3. Manually queue the build to get access to stage Publish Test UI and Publish to Production APIView

Please give a more detailed look at the release stages, then I'm going to pull the trigger on this thing :D

[praveenkuttappan]

Looks good to me.

[scbedd]

Awaiting one last deployment to production slot, then this is ready to merge.

[scbedd]

Merging!