Fix new admin integrations not taking effect on existing project
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/26376
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Changelog entry added, if necessary - 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