Run package-and-test automatically unless MR

What does this MR do and why?

Runs package-and-test automatically in master and other pipelines except MRs. This allows us to choose when we need to run a pipeline in MRs when working on changes that shouldn't require a full test run. But it also avoids accidentally breaking gitlab-qa by ensuring the tests still run in master and before releasing a new version.

See #717 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.