Add test case links to container registry omnibus e2e spec

Désirée Chevalierrequested to merge
qa-add-testcase-links-to-container-registry-omnibus-spec into master

What does this MR do and why?

Adds test case links to container_registry_omnibus_spec using the verbose syntax.

Part of https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/630 and gitlab-qa#662 (closed)

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