Merge branch 'bmarjanovic/add-camfire-to-dsl-fields' into 'master'

Update Campfire integration to use description DSL

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/140708



Merged-by: Suraj Tripathi <stripathi@gitlab.com>
Approved-by: Marcos Rocha <mrocha@gitlab.com>
Approved-by: Suraj Tripathi <stripathi@gitlab.com>
Approved-by: Ashraf Khamis <akhamis@gitlab.com>
Co-authored-by: bmarjanovic <bmarjanovic@gitlab.com>