MDEV-21014 MTR does not detect {A,M,T,L,UB}SAN errors which happen upon server shutdown

Let MTR check for error existence after running a test and return it back to user.

Error reporting itset might be much better, but first of all we need to see that
something went wrong.

mysql-test/mysql-test-run.pl

@@ -4401,6 +4401,8 @@ sub extract_warning_lines ($$) {
      qr/missing DBUG_RETURN/,
      qr/Attempting backtrace/,
      qr/Assertion .* failed/,
+     qr/Sanitizer/,
+     qr/runtime error:/,
     );
   # These are taken from the include/mtr_warnings.sql global suppression
   # list. They occur delayed, so they can be parsed during shutdown rather