Validate MR approver list

Everyone can contribute. Help move this issue forward while earning points, leveling up and collecting rewards.

• Close this issue

Proposal

Split out from #28902 (comment 1439787991)

After the users have entered the details of a rule but before clicking OK, we let users test the rule. We can use our existing logic in the MR to let the users check what the rule would look like when applied.