Merge branch 'jdoyon-add-eclipse-marketplace-documentation' into 'master'

chore: Add Eclipse Marketplace documentation

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/181313



Merged-by: Amy Qualls <aqualls@gitlab.com>
Approved-by: Amy Qualls <aqualls@gitlab.com>
Reviewed-by: Amy Qualls <aqualls@gitlab.com>
Co-authored-by: Jean-Gabriel Doyon <jgdoyon@gitlab.com>