Bundle all unproved targets in a single message and only show all if setting chooses that

test/tools/fuzzer_common.cpp

@@ -20,6 +20,7 @@
 
 #include <libsolidity/interface/OptimiserSettings.h>
 #include <libsolidity/interface/CompilerStack.h>
+#include <libsolidity/formal/ModelCheckerSettings.h>
 
 #include <libsolutil/JSON.h>
 
@@ -104,6 +105,7 @@ void FuzzerUtil::testCompiler(
 		compiler.setModelCheckerSettings({
 			frontend::ModelCheckerContracts::Default(),
 			frontend::ModelCheckerEngine::All(),
+			/*showUnproved=*/false,
 			smtutil::SMTSolverChoice::All(),
 			frontend::ModelCheckerTargets::Default(),
 			/*timeout=*/1