[CI][BASOP-CI] Move basop-CI-related changes to main
Follow up from !2411 (merged): move basop-ci-related things that were only in basop-ci-branch to main to be able to retire basop-ci-branch.
WARNING! Gitlab maintenance operation scheduled for Monday, 20 April between 12:00 and 14:00 (CET). During this time window, short service interruptions (less than 5 minutes) may occur. Thank you in advance for your understanding.
Follow up from !2411 (merged): move basop-ci-related things that were only in basop-ci-branch to main to be able to retire basop-ci-branch.