Fix Rubocop configuration files

See merge request !1043

Ce to ee

See merge request !1037

revert back spec change and use a different cleanup strategy for spec that was forcing a transaction commit

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There is now a `Projects::Settings` module, for the members
controller. Ensure that we get the actual settings, not that module.

Update EE rubocop and rubocop-rspec

See merge request !1033

Port "Restore backup when env variable is passed" to EE

See merge request !1039

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Absorb gitlab_git

See merge request !1027

Added 8.16 CE to EE guide

See merge request !1036

 Conflicts:
	app/assets/stylesheets/pages/boards.scss
    app/views/admin/groups/show.html.haml
    app/views/devise/shared/_tabs_ldap.html.haml
	app/views/notify/new_merge_request_email.html.haml
	app/views/projects/commits/_commit.html.haml
	app/views/projects/commits/show.html.haml
	app/views/projects/merge_requests/widget/_open.html.haml
	app/views/projects/project_members/index.html.haml
	config/routes/project.rb
	spec/features/notes_on_merge_requests_spec.rb
	spec/models/project_spec.rb

Re-order update steps in the 8.14 -> 8.15 upgrade guide

Closes #26014

See merge request !8287

Record and show last used date of SSH Keys

See merge request !8113

Fix broken url on group avatar

Closes #26452

See merge request !8464

1. Gems need to be installed before we can run the
  gitlab:workhorse:install task
1. Update gitlab-shell after gitlab-workhorse since it's a manual step
  that needs to be done in `/home/git/gitlab-shell`
Signed-off-by: Rémy Coutable <remy@rymai.me>

Addresses: Issue #13810

1. Adds a last_used_at attribute to the Key table/model
2. Update a key's last_used_at whenever it gets used
3. Display how long ago an ssh key was last used

Fix dead link in Reply by email documentation

Closes #26247

See merge request !8474

Add label to Environments "Date Created" column

Closes #25371

See merge request !8376