Improve CI

[stuartleeks]

• [X] ensure tests are run (e.g. common)
• [ ] ensure that make build-package in github-action doesn't result in changes (i.e. enforce that it has been run) (#80)
• [ ] ?Split the azdo test into a triggered pipeline and tag with an environment (require approval)
• [x] Add docker-from-docker test for GH action
• [x] Add docker-from-docker test for AzDO task
• [ ] Make AzDO pipeline project public (waiting on being granting build pipeline execution)
• [ ] show the AzDO pipeline run as a check on the PR
• [ ] explore ways to ensure that only a single instance of the AzDO publish VSIX + run build is running at once (maybe less relevant if split and requires approval)