Since we are going to handle the API stuff later we can just leave this as error case since the model validations will stop this

Per discussion in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9646#note_65730532 this logic is being optimized elsewhere and it will simplify things if we make less changes to this code right now.

Rename `runner.belonging_to_group(project.id) -> runner.belonging_to_parent_group_of_project(project.id)`

Link back to root Helm chart page for deprecated GitLab chart

See merge request gitlab-org/gitlab-ce!18442

Explain Auto DevOps better

See merge request gitlab-org/gitlab-ce!18282

Make ghe url consistent ce docs

See merge request gitlab-org/gitlab-ce!18334

Add better explanation for CI_PIPELINE_SOURCE

See merge request gitlab-org/gitlab-ce!18111

Resolve "The screenshots on the Groups documentation page are outdated"

Closes #45653

See merge request gitlab-org/gitlab-ce!18542

Link to Snippets API docs from API index

See merge request gitlab-org/gitlab-ce!18536

Fix timeouts of end-to-end tests with GitLab QA

Closes gitlab-qa#224

See merge request gitlab-org/gitlab-ce!18583

Legacy disk path refactor

Closes gitaly#1111

See merge request gitlab-org/gitlab-ce!18364

Fix tabs container styles to make RSS button clickable

Closes #45398

See merge request gitlab-org/gitlab-ce!18559

Restore label underline color

Closes #44177

See merge request gitlab-org/gitlab-ce!18407

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