[EE] Prepare for bypassing GitLab sign in in feature specs

See merge request !2140

Enable autocomplete on project snippets -- EE merge edition

See merge request !2174

CE upstream: Thursday

Closes gitlab-ce#31782, gitlab-ce#33529, gitlab-ce#32861, gitlab-ce#33483, #2525, gitlab-ce#31263, gitlab-ce#33403, and gitlab-ce#33106

See merge request !2137

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/1210 disabled
autocomplete for personal snippets and project snippets. But we want
autocomplete on project snippets.

Disable autocomplete on snippets comments -- EE merge edition

Closes gitlab-ce#33594

See merge request !2167

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/33594

Was supposedly fixed in MR for
https://gitlab.com/gitlab-org/gitlab-ce/issues/32086 but seeing this pop
up again

adds prometheus metrics to both mirro and remote mirror features

See merge request !2118

removes ignore column sync time logic from remote mirror model

See merge request !1850

Not sure why this fails with the full login flow, but it's not necessary
and would've been changed eventually anyway, so whatever!

Change `logout_direct` uses to `gitlab_sign_out_direct`

Change single `login_via` use to `gitlab_sign_in_via`

- [x] Rename `login_as` to `gitlab_sign_in`
- [x] Rename `login_with` to `gitlab_sign_in_with`
- [x] Rename `login_via` to `gitlab_sign_in_via`
- [x] Rename `logout` to `gitlab_sign_out`
- [x] Rename `logout_direct` to `gitlab_sign_out_direct`
- [x] Make `gitlab_login_with` (née `login_with`) private
- [x] Make `mock_auth_hash` private

Document the Delete Merged Branches functionality

See merge request !2149

Add ConvDev docs

See merge request !2148

Geo: prevent Gitlab::Git::Repository::NoRepository from stucking replication

Closes #2635

See merge request !2115

Port of mk-add-project-moved-errors-for-git to EE

See merge request !1870

Fix admin_audit_logs_spec transient

See merge request !2157

Refresh LDAP-users project authorizations on group sync

Closes #2662

See merge request !2145

Add namespace license checks for Service Desk (EEP)

Closes #2565

See merge request !2109

Don't track historical data when license is trial

See merge request !2138

Rename "Slash commands" to "Quick actions" -- EE merge edition

Closes gitlab-ce#27070

See merge request !2012

set ENV['prometheus_multiproc_dir'] in config/boot.rb instead of config.ru

See merge request !2151