[CI] Automatically run all system tests in pgsched pipelines
Description
Since the Postgres system tests should all pass now, we should enable all system tests to run automatically when this option is selected instead of blocking after the Docker build stage.
Checklist
-
Documentation reflects the changes made. -
Merge Request title is clear, concise, and suitable as a changelog entry. See our contributing docs
References
Closes #1420 (closed)