Add job to run rubocop docs link check in docs pipelines
What does this MR do and why?
We should run the new cop that checks docs link from ruby files in all docs-only pipelines: !165516 (merged)
If we change a filename or anchor in docs, the links from UI will break, so we need to run this check in docs pipelines too, similar to ui-docs-links lint (https://gitlab.com/gitlab-org/gitlab/-/blob/12aa17f36517a26b278379d89098e5387f025767/.gitlab/ci/docs.gitlab-ci.yml#L98-106) which checks docs links from HAML files.
- Example recent docs pipeline with no rubocop check: https://gitlab.com/gitlab-org/gitlab/-/pipelines/1502181007
- Sample
rubocop-docsfrom this MR: https://gitlab.com/gitlab-org/gitlab/-/jobs/8123771069
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