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feat(group_markdown_uploads): add upload a file to a group
Adds GroupMarkdownUploadsService.UploadGroupMarkdown for POST /groups/:id/uploads. It uploads a file to a group and returns a Markdown-formatted link to it.
Reference: GitLab API docs: https://docs.gitlab.com/api/group_markdown_uploads/#upload-a-file-to-a-group
Fixes: #2319 (closed)