If project type clusters, it should only have projects assigned.
Similarly with groups.

Re=uses the shared concern CreatesCluster which we previously extracted
from Projects::ClustersController
Extracts creation of cluster to controller concern

Extracted from `Projects::ClustersController#new`, `#create_gcp`,
`#create_user` into new common module, with shared views and shared
examples. This allows Groups::ClustersController to share most of the
code.

- maintainer for group can read, create, update, and admin cluster
- project user, at any level, cannot do anything with group cluster

For the conceivable future, a cluster will have at most one group.

Even though we currently only should have one group for a cluster, we
allow the flexibility to associate to other groups in the future.

This also matches the runner <=> groups association.

This will make it easier to perform in place adjustments, etc for future
MRs involving group clusters.

Extracted from `Projects::ClustersController#new`, `#create_gcp`,
`#create_user` into new common module, with shared views and shared
examples. This will allow when we have Groups::ClustersController to
share most of the code.

Address ModuleWithInstanceVariables warnings by moving to render with
locals

Project::ClustersController spec improvement

See merge request gitlab-org/gitlab-ce!22346

Resolve "Prometheus not showing as installed, even though it is"

Closes #51972

See merge request gitlab-org/gitlab-ce!22356

Make source param optional according to EE change

See merge request gitlab-org/gitlab-ce!22283

It has been pointed out that `go` is used quite extensively so it's not
an unknown idiam here at GitLab. And we have arguments with `go` which
is a plus.

Use InvalidUTF8ErrorHandler only for rails 4

Closes #51908

See merge request gitlab-org/gitlab-ce!22340

Before this commit updating Prometheus (e.g. adding alerts) made it
"updated" therefore not installed.

Fix typo: 9.5.8 => 9.5.10

See merge request gitlab-org/gitlab-ce!22368

Fix link to 'when delayed' YAML configuration item

See merge request gitlab-org/gitlab-ce!22349

Does not allow a SSH URI when importing a project

See merge request gitlab-org/gitlab-ce!22309

Revert "Merge branch 'ce-6983-promote-starting-a-gitlab-com-trial' into 'master'"

See merge request gitlab-org/gitlab-ce!22315

Docs: Fixes image shadow

See merge request gitlab-org/gitlab-ce!22366

Define Stage labels in issue workflow

See merge request gitlab-org/gitlab-ce!22313

docs remove reference to push rules as not yet implemented for groups

See merge request gitlab-org/gitlab-ce!22305

Replace `<i>` in vue components with `<icon>`

See merge request gitlab-org/gitlab-ce!20748

Remove Koding integration and documentation

Closes #39697

See merge request gitlab-org/gitlab-ce!22334

Allow Issue and Merge Request sidebar to be toggled from collapsed state

Closes #52532

See merge request gitlab-org/gitlab-ce!22353

Add a new QA::ElementWithPattern cop

Closes #52516

See merge request gitlab-org/gitlab-ce!22298

Allow getting the merge base of multiple revisions

Closes #52573

See merge request gitlab-org/gitlab-ce!22295

Add documentation how to assign a merge request for review

See merge request gitlab-org/gitlab-ce!21327

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

Remove dependencies on Linguist

Closes #35450

See merge request gitlab-org/gitlab-ce!21008

Refactor Cluster services to enable groups or projects

See merge request gitlab-org/gitlab-ce!22181

Fixes close/reopen quick actions preview for issues and merge_requests

Closes #52669

See merge request gitlab-org/gitlab-ce!22343

Fix code reuse issue in Projects::Clusters::ApplicationController#index

See merge request gitlab-org/gitlab-ce!22182

Merge branch '49417-improve-settings-pages-design-by-prioritizing-content-group-settings' into 'master'

Prioritize group settings, improve panel titles, disable submit without changes

Closes #49417

See merge request gitlab-org/gitlab-ce!21115