It's mainly intended to improve Elasticsearch indexing performance
(through multi_json gem), but other gems could benefit from it too, like
grape.

Closes #22260

[ci skip]
Signed-off-by: NRémy Coutable <remy@rymai.me>

Closes #21218

[ci skip]
Signed-off-by: NRémy Coutable <remy@rymai.me>

[ci skip]
Signed-off-by: NRémy Coutable <remy@rymai.me>

add tests with dependent destroy

add tests with dependent destroy

add tests

add tests to projects spec

update it title  and remove let

update it title  and remove let

remove changes after rebase

remove changes after rebase

update changelog

This moves tracking of the pushes since the last Git GC from PostgreSQL
to Redis. This reduces the number of writes on the "projects" table.
This in turn reduces the vacuuming overhead.

The lease used for incrementing the counter has been removed. This lease
was mostly put in place to prevent high database load but this isn't
needed anymore due to the counter now being stored in Redis.

Fixes gitlab-org/gitlab-ce#22125

Fixes #21842

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

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/21823

[ci skip]

Closes #22092

So we have a detailed view of what checks perform bad

GitlabShell verify access sending ‘_any’ as the changes made on the git command, in those cases Gitlab::Checks::ChangeAccess won’t receive a branch_name so we don’t need to check for access to the 
protected branches on that repository. So we avoid some git operations in case the are not cached (empty_repo?) and some database lookups to get protected branches.

These request is happening in every push.

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

# Conflicts:
#	lib/gitlab/github_import/importer.rb

MySQL could not have support for millisecond precision, depends on the MySQL version 
so we just create issues in different seconds in a deterministic way

Currently this permission check incurs a significant performance hit on loading issues
where it does not make sense to check this permission in the first place.

Closes #20750

Also streamline the sorting part while we're at it.

That being done, there's currently a duplication between
`GET /projects/search/:query` and `GET /projects?search=:search`
so we might want to keep only the latter for 9.0...
Signed-off-by: NRémy Coutable <remy@rymai.me>

refactors update file

[ci skip]

Use NotificationSetting::EMAIL_EVENTS for params

Closes #21982