test: set test-emit-after-on-destroyed as flaky

Ref: #50245
PR-URL: #50246
Refs: #50245
Reviewed-By: Filip Skokan <[email protected]>
Reviewed-By: Geoffrey Booth <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>

Author: anonrig

test/async-hooks/async-hooks.status

@@ -21,3 +21,5 @@ test-callback-error: PASS, FLAKY
 [$system==freebsd]
 
 [$system==aix]
+# https://github.com/nodejs/node/issues/50245
+test-emit-after-on-destroyed: PASS, FLAKY