test: fix test-cluster-send-handle-large-payload

test-cluster-send-handle-large-payload is susceptible to failure if it
is competing for resources. Move to `sequential` directory so it is not
competing with other tests.

Fixes: https://github.com/nodejs/node/issues/14844

PR-URL: https://github.com/nodejs/node/pull/19311


Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>