test: set test-watch-mode-inspect as flaky

PR-URL: nodejs/node#50259
Refs: nodejs/node#49933
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>

graal-nodejs/test/sequential/sequential.status

@@ -80,6 +80,8 @@ test-tls-psk-client: PASS, FLAKY
 test-tls-securepair-client: PASS, FLAKY
 
 [$arch==arm]
+# https://github.com/nodejs/node/issues/49933
+test-watch-mode-inspect: PASS, FLAKY
 
 [$arch==s390x]
 # https://github.com/nodejs/node/issues/41286