Fix coding style

Improve coding style

Decouple UPDATE and DELETE operations of asset links

Rename links_attributes to assets:links

Rename exposed param and updated spec

Fix spec for mysql unique validation failure

- Add Releases::Links model
- Expose it in release API
- Add integration tests

gitlab-org/gitlab-shell!166 added support for collecting push options
from the environment, and passing them along to the
/internal/post_receive API endpoint.

This change handles the new push_options JSON element in the payload,
and passes them on through to the GitPushService and GitTagPushService
services.

Futhermore, it adds support for the first push option, ci.skip.  With
this change, one can use 'git push -o ci.skip' to skip CI pipe
execution. Note that the pipeline is still created, but in the "skipped"
state, just like with the 'ci skip' commit message text.

Implements #18667

Add spec for all release API - GET, POST, PUT, DELETE.
Also, fixes some minior bugs.

Introduce DELETE endpoint in Release API

47d4890d changed the order of pagination so that the full list of
branches would be passed to Gitaly to determine which ones had been
merged, but this operation can timeout for large repositories with
many branches. We only need to determine whether the found branches have
been merged, so limit the scan to those.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/55724

Specifically, the `ListAllMyBuckets` permission.

This works if you know the directory exists.

See more:

* https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23981
* https://stackoverflow.com/a/12288581/1992201

Updates specs to use new rails5 format.

The old format:
`get :show, { some: params }, { some: headers }`

The new format:
`get :show, params: { some: params }, headers: { some: headers }`

We're filtering the events using `Event#visible_to_user?`.

At most we're loading 100 events at once.

Pagination is also dealt with in the finder, but the resulting array
is wrapped in a `Kaminari.paginate_array` so the API's pagination
helpers keep working. We're passing the total count into that
paginatable array, which would include confidential events. But we're
not disclosing anything.

This reverts commit 00acef43.

Add a new endpoint
`projects/:id/jobs/artifacts/:ref_name/raw/*artifact_path?job=name`
which is the close the web URL for consistency sake. This endpoint can
be used to download a single file from artifacts for the specified ref
and job.

closes https://gitlab.com/gitlab-org/gitlab-ce/issues/54626

The Correlation ID is taken or generated from received X-Request-ID.
Then it is being passed to all executed services (sidekiq workers
or gitaly calls).

The Correlation ID is logged in all structured logs as `correlation_id`.

Resolve "Can add an existing group member into a group project with new permissions but permissions are not overridden"

This reverts commit 22954f22

LfsToken::HMACToken#token_valid?() will be examined and if false, look
in redis via LfsToken::LegacyRedisDeviseToken#token_valid?().

Adds gitlab.impersonation_enabled config option defaulting to true to
keep the current default behaviour.

Only the act of impersonation is modified, impersonation token
management is not affected.

[master] Resolve "Reflected XSS in OAuth Authorize window due to redirect_uri allowing arbitrary protocols"

See merge request gitlab/gitlabhq!2572

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

This suggests possibly related issues when the user types a title.

This uses GraphQL to allow the frontend to request the exact
data that is requires. We also get free caching through the Vue Apollo
plugin.

With this we can include the ability to import .graphql files in JS
and Vue files.
Also we now have the Vue test utils library to make testing
Vue components easier.

Closes #22071

Clears the import related columns and code from the Project
model over to the ProjectImportState model

By using the parameters `?labels=None|Any` the user can filter
issues/mrs from the API that has `none/any` label.

Affected endpoints are:

- /api/issues
- /api/projects/:id/issues
- /api/groups/:id/issues
- /api/merge_requests
- /api/projects/:id/merge_requests
- /api/groups/:id/merge_requests

Move all logic for destroying a Pipeline into a service so it's easily
reusable.