Merge branch 'remove-jira-github-enterprise-dvcs-connector' into 'master'

Remove Jira GitHub Enterprise DVCS connector

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/119889



Merged-by: Achilleas Pipinellis <axil@gitlab.com>
Co-authored-by: Magdalena Frankiewicz <mfrankiewicz@gitlab.com>
Co-authored-by: Luke Duncalfe <lduncalfe@gitlab.com>
Co-authored-by: Ashraf Khamis <akhamis@gitlab.com>