build: Rename 'test' job to clearer 'build-coverage-report'
This should be a no-op except for clearer labels in the CI pipeline descriptions.
Bug: T337504
How to register an account on GitLab. To prevent spam, new accounts are locked until approved by an admin or the approver bot. You can also file an unlock request to expedite access.
Support: mw:GitLab, how to host a project on GitLab, #wikimedia-gitlab on libera.chat, #GitLab on Phabricator.
This should be a no-op except for clearer labels in the CI pipeline descriptions.
Bug: T337504