Fix cross-project references copy to include the project reference
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/25890
So the project reference is included while copy the link to issues or MRs.
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Changelog entry added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master
(if it does - rebase it please) -
Squashed related commits together