Fix link on contributing page
On https://about.gitlab.com/contributing/ sponsor development should link to https://about.gitlab.com/development/ (and not consultancy)
/cc @JobV
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
On https://about.gitlab.com/contributing/ sponsor development should link to https://about.gitlab.com/development/ (and not consultancy)
/cc @JobV