EE MR: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/14598

Previously the Housekeeping button and API would use the counter of last
pushes to determine whether to do a full garbage collection, or whether
to do one of the less comprehensive tasks: a full repack, incremental
pack, or ref pack. This was confusing behavior, since a project owner
might have to click the button dozens of times before a full GC would be
initiated.

This commit forces a full GC each time this is initiated. Note that the
`ExclusiveLease` in `HousekeepingService` prevents users from clicking
on the button more than once a day.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/63349

The `#reload` makes to load all objects into memory,
and the main purpose of `#reload` is to drop the association cache.

The `#reset` seems to solve exactly that case.

This backports various parameter changes EE makes to API::Projects,
along with moving some code around to make it easier to extend in EE.

The repository charts page used to detect the repository language for
each request that was made to the page. Given the detection is an
expensive operation and the same data is stored in the database the
database is now serving the request.

The same goes for an API endpoint that serves the languages.

When a repository is empty or non-existent the languages will always be
empty. And the language detection RPC isn't requested.

Closes: https://gitlab.com/gitlab-org/gitlab-ce/issues/47390

default_branch, statistics and config_ci_path are now only exposed if
the user has permissions to the repository.

Also changes old calls to the service

It also renames the API::PROJECT_ENDPOINT_REQUIREMENTS constant to
API::NAMESPACE_OR_PROJECT_REQUIREMENTS

Partially addresses #47424.

Had to make changes to spec files because
stubbing methods on frozen objects is a mess
in RSpec and leads to failures:

https://github.com/rspec/rspec-mocks/issues/1190

This whitelists all existing offenses for the various CodeReuse cops, of
which most are triggered by the CodeReuse/ActiveRecord cop.

Before this change only GitLab admins where allowed to set up forking
relation through the API. This changes that so project owners can
do this too.

Closes gitlab-org/gitlab-ce#40550.

System hooks were not being triggered when projects were archived or
unarchived. Reuse the Projects::UpdateService to automatically
trigger system hooks and increase code reuse.

Signed-off-by: Marko, Peter <peter.marko@siemens.com>

In this endpoint the `jobs_enabled` parameter must be
translated to `builds_enabled` before being passed to
the `Projects::CreateService`.

This ensures that we have more visibility in the number of SQL queries
that are executed in web requests. The current threshold is hardcoded to
100 as we will rarely (maybe once or twice) change it.

In production and development we use Sentry if enabled, in the test
environment we raise an error. This feature is also only enabled in
production/staging when running on GitLab.com as it's not very useful to
other users.

Resolve "Projects API: filter 'with_issues_enabled=true' returns projects with 'issues_enabled=false'"