test: mark test-esm-loader-http-imports as flaky

This test has been failing occasionally for weeks.

Refs: #47836
Refs: nodejs/reliability#564
PR-URL: #47987
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: tniessen

test/es-module/es-module.status

@@ -5,3 +5,7 @@ prefix es-module
 # sample-test                        : PASS,FLAKY
 
 [true] # This section applies to all platforms
+
+[$system==linux || $system==freebsd]
+# https://github.com/nodejs/node/issues/47836
+test-esm-loader-http-imports: PASS,FLAKY