Demonstrate file watcher issue

Have to give the gen_server time to fail fully to see the test fail
because the supervisor will restart fast/often enough to get through
the test run otherwise.

test/ldclient_file_SUITE.erl

@@ -210,6 +210,8 @@ check_file_watcher(_) ->
     {{0, true, fallthrough}, _} = ldclient_eval:flag_key_for_user(watch_files, <<"test-flag">>, #{key => <<"user123">>}, "foo"),
     %The timestamp for the modified time is in seconds. So we wait a moment to get a new timestamp compared to creation.
     timer:sleep(1200),
+    %Sleep long enough for the gen_server to stop retrying/recovering to demonstrate the failure
+    timer:sleep(5000),
     file:write_file("tmpfile.json", ["{\"flagValues\": {\"test-flag\": false}}"]),
     timer:sleep(1000),
     {{0, false, fallthrough}, _} = ldclient_eval:flag_key_for_user(watch_files, <<"test-flag">>, #{key => <<"user123">>}, "foo").