Support pending invitation project members importing projects
Adds support for pending invitation project members on Import/Export - previously the import would fail.
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/19973
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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 style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together