Closes #30964

Only show public emails in atom feeds

See merge request !2066

This reverts commit cb10b725c8929b8b4460f89c9d96c773af39ba6b.

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

Honour issue and merge request visibility in their respective finders

This MR fixes a security issue with the IssuesFinder and MergeRequestFinder where they would return items the user did not have permission to see. This was most visible on the issue and merge requests page for a group containing projects that had set their issues or merge requests to "private".

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/22481

See merge request !2000

This class can be used to reduce a list of issues down to a subset based
on user permissions. This class operates in such a way that it can
reduce issues using as few queries as possible, if any at all.

fix issues pointed out in !6527

add task completion status feature to CHANGELOG