This reverts merge request !18002

Also includes a comment on Ci::Config regarding that's going to be
override by EE

- Create ci/lints controller inside project/
- Move js pages to be inside projects/
- Copy view ci/lint view to be inside project folder
- Remove ci/lint view and js files

Closes #43603

When we added caching, this meant that calling `can_be_resolved_in_ui?` didn't
always call `lines`, which meant that we didn't get the benefit of the
side-effect from that, where it forced the conflict data itself to UTF-8.

To fix that, make this explicit by separating the `raw_content` (any encoding)
from the `content` (which is either UTF-8, or an exception is raised).

Now the issuable reference check works only in project scope, if we
reference an issuable from a non-project resource (e.g. epics), then
project is not set, and there is mismatch in generated issue references.

This patch enables issuable reference state check also from group scope.

Closes gitlab-ee#4683
Related to #30916

Closes gitaly#1101

Before we were using a "plumbing" Gitlab::Git method that does not go
through Gitaly migration checking.

Fix "A copy of Gitlab::Middleware::Readonly has been removed from the module tree but is still active"

Similar to #34047 and #29327

They were probably added to compensate for tests shortcomings, but now
they don't complain.

Closes gitaly#1095

Douwe Maan authored 6 years ago and Mark Fletcher committed 6 years ago

Server Side Request Forgery in Services and Web Hooks

See merge request gitlab/gitlabhq!2337

Updated in:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17673