Draft: CI Improvements

What does this PR do? (Please give us a brief description of what this PR does.)

(Not finished yet)

It improves CI.

It does:

• Run the linters first
  This catches errors faster.
• Run test/lint per package in a seperate job, improving runtime
  Also makes it more convinenint in the gitlab interface to figure out what failed
• Additionyally runs all tests/lint on node:latest, to catch any problems with newer node versions
• Builds containers for prs, in the format pr-$BRANCH-$SHORTSHA to allow for simpler testing

Contribution Guidelines By submitting this merge request, you agree to follow our Contribution Guidelines

• I agree to follow this project's Contribution Guidelines
• I have made sure to test this pull request