- Add new service that transfers milestones
from a group to a project
- Include new service in Projects transfer service
- Include FromUnion module in Milestone model
to use in transfer service
- Add specs for new milestones service
- Add specs for transferring milestones in
project transfer service

Immediate configuration is not ideal for group and instance
level clusters as projects that may never be deployed would
still have Kubernetes namespaces and service accounts created
for them.

As of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25586
we now create only the resources that are required for the
project being deployed, at the time of deployment.

- Externalize strings in milestones_helper
- Externalize strings in app/services
- Update PO file

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.

AFAIK the only relevant place is Projects::CreateService, this gets
called when user creates a new project, forks a new project and does
those things via the api.

Also create k8s namespace for new group hierarchy
when transferring project between groups

Uses new Refresh service to create k8s namespaces

- Ensure we use Cluster#cluster_project

If a project has multiple clusters (EE), using Project#cluster_project
is not guaranteed to return the cluster_project for this cluster. So
switch to using Cluster#cluster_project - at this stage a cluster can
only have 1 cluster_project.

Also, remove rescue so that sidekiq can retry

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

This adds a database migration that creates routes for any projects and
namespaces that don't already have one. We also remove the runtime code
for dynamically creating routes, as this is no longer necessary.

Partially addresses #47424.

Direct disk access is done through Gitaly now, so the legacy path was
deprecated. This path was used in Gitlab::Shell however. This required
the refactoring in this commit.

Added is the removal of direct path access on the project model, as that
lookup wasn't needed anymore is most cases.

Closes https://gitlab.com/gitlab-org/gitaly/issues/1111

Closes #37462.

With hashed storage enabled, we would fail to transfer a project to another
namespace because the provided paths were wrong. Instead, we should not
attempt to move paths at all.

Closes gitlab-org/gitlab-ee#4056

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

This ensures that project authorizations are refreshed when moving a
project from one namespace to another. When doing so the permissions for
all users of both the old and new namespaces are refreshed.

See #26194 for more information.

- Move UploadsTransfer to ProjectTransfer and inherit from this to UploadsTransfer and PagesTransfer

Flushing the events cache worked by updating a recent number of rows in
the "events" table. This has the result that on PostgreSQL a lot of dead
tuples are produced on a regular basis. This in turn means that
PostgreSQL will spend considerable amounts of time vacuuming this table.
This in turn can lead to an increase of database load.

For GitLab.com we measured the impact of not using events caching and
found no measurable increase in response timings. Meanwhile not flushing
the events cache lead to the "events" table having no more dead tuples
as now rows are only inserted into this table.

As a result of this we are hereby removing events caching as it does not
appear to help and only increases database load.

For more information see the following comment:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6578#note_18864037

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb