test: mark test-return-on-exit as flaky

It fails sporadically in debug builds because the
"--stress-compaction --gc-interval=100" flags make Node.js crash.

Refs: nodejs#36139

test/parallel/parallel.status

@@ -5,6 +5,8 @@ prefix parallel
 # sample-test                        : PASS,FLAKY
 
 [true] # This section applies to all platforms
+# https://github.com/nodejs/node/pull/36139
+test-domain-error-types: PASS,FLAKY
 
 [$system==win32]
 # https://github.com/nodejs/node/issues/20750