Reopen issues closed by merge request when reverting it

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Description

When you click 'Revert' button in merge request, and reverting MR eventually gets merged, issues closed by original merge request are not reopened.

Proposal

Append Reopen #12345 text to the reverting MR, and make it possible to reopen issue that way.

Edited by 🤖 GitLab Bot 🤖