Migrate all Ci::Project data to Project

This is final data migration step after CI to GitLab merge.

Plan is:

• to remove use of Ci::Project and migrate CI related data to Project,
• to remove GitLabCiService (or refactor),
• to merge CI services in GitLab Services,
• to attach all CI related data to Project: Triggers, Variables, Runners,
• to remove Ci::ApplicationSettings.

I think I saw merge requests for this.

Implemented in !1985 (merged) !1987 (merged)

merged, so closing this.

Status changed to closed

And it's live on gitlab.com and it appears that is working :)

mentioned in merge request !14785