Update to use common pipelines and release-it

Description

Needs/potential problems:

• GKE runner just for this project
• Tox tests fail due to package build process (clients embedded in source)
• Other issues report test-pypi failures
• Pushing to (test) pypi through common pipeline
  • Fallback to gitlab registry if this can't be made to work
  • This should not (as it currently does) be a requirement for a merge request to be able to be merged (i.e. not pushing to test pypi isn't a pipeline failure), else it is not possible to merge non-release MRs

Further details

Task list

• Add GKE runner for project
• Update to use common pipeline resolving build/test issues
  • Potentially having to change how the package is built

Acceptance criteria

• Library using common pipelines
• Build and Tests pass

Links/references