test: mark test-vm-timeout-escape-nexttick flaky

This is a known failure so mark it such, so that
CI is green / amber while the issue is being progressed.

PR-URL: nodejs#24712
Refs: nodejs#24620
Refs: nodejs#24120
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Richard Lau <[email protected]>

Author: gireeshpunathil

test/known_issues/known_issues.status

@@ -18,3 +18,7 @@ test-vm-timeout-escape-promise: PASS,FLAKY
 [$system==freebsd]
 
 [$system==aix]
+
+[$arch==arm]
+# https://github.com/nodejs/node/issues/24120
+test-vm-timeout-escape-nexttick: PASS,FLAKY