Sets safe defaults for harbor project names in docker.yaml

General MR

Summary

This breakage looks like an unintended consequence of !788 (merged). We likely got bitten first because reposync and edge are the only groups extending the docker.yaml jobs.

Relevant logs/screenshots

Validated fixes over in package-validation repo:

• ✅ MR workflow
• ✅ Pipeline workflow (deploy)

Linked Issue

Closes #586 (closed).

Upgrade Notices

N/A