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

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

* Note that protected branches will not be part of the deletion

Backport merge_params.html.haml conflict comment

See merge request !2120

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/27070

Deprecate "chat commands" in favor of "slash commands"

We looked for things like:

 - `slash commmand`
 - `slash_command`
 - `slash-command`
 - `SlashCommand`

Conflicts:
	doc/user/project/slash_commands.md
	doc/workflow/time_tracking.md

EE: Fix raw_path with the new job path, rename builds to jobs in test

See merge request !2129

EE: Use the same way to invalidate cache from EE

See merge request !2134

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