test: ensure npm version is not release candidate
v11.6.0 ended up shipping with an npm version 6.5.0-next.0.
This test should avoid it happening in the future.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
v11.6.0 ended up shipping with an npm version 6.5.0-next.0.
This test should avoid it happening in the future.