[API] Fix URLs in the 'Link' header for 'GET /projects/:id/repository/contributors' when no value is passed for 'order_by' or 'sort'

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

Repository archives are always named `<project>-<ref>-<sha>` even if
the ref is a commit. A consequence of always including the sha even
for tags is that packaging a release is more difficult because both
the ref and sha must be known by the packager.

- add append_sha option (defaults true) to provide a method for
toggling this feature.

Support added to GitLab Workhorse by gitlab-org/gitlab-workhorse!232

Allows ordering in GET api/v4/projects/:project_id/repository/contributors
through `order_by` and `sort` params.
The available `order_by` options are: name|email|commits.
The available `sort` options are: asc|desc.

This reverts commit b0498c17

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

Remove unecessary endpoint from repository, add compatibility endpoints for v3 and several improvements

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

See #17478

Closes #15105

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

This change relies on changes in gitlab_git and gitlab-git-http-server.

Create RepoTag Grape entity and present it when doing stuff with tags via API. Update API doc for repositories. Add tag message to tag list page in UI. Update Changelog. Update spec to set .gitconfig identity, required for annotated tags.

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

Added annotated tags.  Updated tag haml file and call to gitlab-shell.  Updated API for annotated tags.  Added tests for API.  Strip leading/trailing whitespace from message, if present.  Update CHANGELOG.

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

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