fix: enforce `isDefEqStuckEx` at `unstuckMVar` procedure Closes #2736 See comment at `ExprDefEq.lean` for explanation. Side effects: - Improved error messages in two tests. - Had to improve `getSuccesses` procedure at `App.lean`. It now discards candidates that contain postponed elaboration problems. If it is too disruptive for Mathlib, we should try to discard the ones that have postponed metavariables.
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