fix: isolate postponed in withSynthesize#13876
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This PR fixes
withSynthesizeto reset the list of postponed universe constraints before running the actionkandsynthesizeSyntheticMVars. Previously,withSynthesizejust ransynthesizeSyntheticMVarswith all existing universe constraints, causing failures even when usingwithSynthesizewith a no-op.Closes #13875.