Merge bitcoin/bitcoin#29304: fuzz: Exit and log stderr for parse_test_list errors

9d09c873a5 fuzz: Exit and log stderr for parse_test_list errors (dergoegge)

Pull request description:

  We should log all errors that occur when attempting to print the harness list in the fuzz test runner.

ACKs for top commit:
  maflcko:
    lgtm ACK 9d09c873a5

Tree-SHA512: 50471b732c8cbe287dacba14487e7c8a5826f146432d93aa3bb55d063a8ba158d01641d6cb1360241dd4cd54ef5e045b0412f9cc34d06c181134921d1f1ceced

test/fuzz/test_runner.py

@@ -372,8 +372,8 @@ def parse_test_list(*, fuzz_bin):
             'PRINT_ALL_FUZZ_TARGETS_AND_ABORT': ''
         },
         stdout=subprocess.PIPE,
-        stderr=subprocess.DEVNULL,
         text=True,
+        check=True,
     ).stdout.splitlines()
     return test_list_all