By adding various composite indexes we can reduce the time spent
retrieving issue lists. Because of the way these indexes are built
column wise we can also remove some standalone indexes, keeping the
total number of indexes in check.

Don't send rejection mails for all auto-generated mails

Closes #28472

See merge request !13254

Ensure we run installation Rake tasks in a clean env in TestEnv

Closes #35859

See merge request !13249

This would be much more accurate. We assume this is an
auto-generated email if such header is provided, and
the value is not "no". It could also be: "auto-generated",
"auto-replied", or other values from extension. It seems
that only "no" could mean that this is sent by a human.

See: https://tools.ietf.org/html/rfc3834

Do not validate CSRF token in API unless needed

Closes #35705

See merge request !13256

Remove test gitaly when older than version file

See merge request !13250

Fly-out dropdown menu in new sidebar

Closes #34026

See merge request !12938

Fix Prometheus application settings help link to point to Prometheus help page

Closes #33921

See merge request !13258

Disable the Rails/Delegate cop

Closes #35869

See merge request !13267

Empty project factory by default

See merge request !13260

See https://gitlab.com/gitlab-org/gitlab-ce/issues/35869 for the
rationale.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Change project FK migration to skip existing FKs

Closes #35243

See merge request !13235

Signed-off-by: Rémy Coutable <remy@rymai.me>

If we call `system('rake', 'taks_name')`, `ENV['RUBYOPT']` is set to
`'-rbundler/setup'` but some tasks (e.g. `gitlab:gitaly:install` need
a clean env since they install their own Gem bundle.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Also make it easier to have mailer helper

Add icons to project sidebar

Closes #34027 and #35877

See merge request !13204

Uniquify reserved word usernames on OAuth user creation

See merge request !13244

Synchronous zanata community contribution translation

Closes #35003

See merge request !13242

Show auto-generated avatars in Groups dashboard tree for Groups without avatars

See merge request !13188

Make Delete Merged Branches handle wildcard protected branches correctly

Closes #35592

See merge request !13251

Update milestone docs CE

See merge request !13233

The "Delete Merged Branches" button should filter out protected
branches matching the wildcard patterns.

Closes gitlab-org/gitlab-ce#35592.

This changes the migration ProjectForeignKeysWithCascadingDeletes so
that it does not add already existing foreign keys and indexes, making
it easier to re-run the migration.

Expose target_iid in Events API

See merge request !13247

Extending API for protected branches

See merge request !12756

Add rugged_is_ancestor method

See merge request !13232

Fix Issue board when using Ruby 2.4

Closes #35769

See merge request !13220

Make the 'issuables list meta-data' shared example less dangerous

See merge request !13236