Split integration tests into separate build

[carolynvs]

What does this change

• Rename e2e to smoke tests. These should quickly (<3min) check that we didn't drastically break porter.
• Always run the smoke tests for a pull request, but only run the integration tests when files related to the runtime changed.
• You can manually run the integration tests with /azp run porter-integration
• Only run the tests for canary releases. Maintainers tagging a release should always check canary is green first.

What issue does it fix

Closes #1546

Notes for the reviewer

I'd also like to see example bundle building split out too eventually.

Checklist

• Unit Tests
• Documentation
• Schema (porter.yaml)

[carolynvs]

/azp run porter-integration

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[carolynvs]

The default PR build is now 8 minutes, including time farting around waiting for an agent.

[carolynvs]

/azp run porter-integration

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[vdice]

Instead of (or in addition to) including tests/smoke/*, would we want to include tests/integration/*?

[carolynvs]

Oops, yeah that was a brain fart. I'm glad you caught that!

[carolynvs]

Fixed. I know I have a tire fire of commits, so I will squash when we merge.

[vdice]

LGTM!