Review Pull Requests + Environments + Azure DevOps

**Is your feature request related to a problem? Please describe.**
Reviewing pull requests in pre-production environments is only supported via GitHub actions today.

**Describe the solution you'd like**
It would be awesome to support this (Static Web App Environments + Pull Requests) in Azure DevOps now that DevOps is a supported repository source for Static Web Apps.

**Describe alternatives you've considered**
The current alternative is to create an Azure Static Web App per environment and use multi-stage build pipelines to deploy changes through environments.

**Additional context**
> Currently, only GitHub Actions deployments support pre-production environments.

See: https://docs.microsoft.com/en-us/azure/static-web-apps/review-publish-pull-requests