test: Mark test-stop-profile-after-done flaky

It is flaky on Windows and AIX. Some more time is needed to fix it.

PR-URL: https://github.com/nodejs/node/pull/14874#pullrequestreview-56752371


Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>