Resolve "BigBang Pipelines should call Package tests"

Summary

Adding script in tests/scripts to search for "enabled: true" packages in tests/ci/k3d/values.yaml, and iterate through chart/values.yaml to pull in the repo to run cypress testing in each package's "tests" folder.

Script runs as part of "clean install" and "upgrade" pipeline stages.

Artifacts for clean install are saved only on success (because of previous setup with images.txt only on success) but upgrade artifacts are configured to save cypress testing output always.

Closes #79

See merge request platform-one/big-bang/bigbang!323