test: remove duplicate test
The test in test/parallel/test-stream-writable-callback-twice.js is
duplicated in test/parallel/test-stream-writable-write-cb-twice.js.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The test in test/parallel/test-stream-writable-callback-twice.js is
duplicated in test/parallel/test-stream-writable-write-cb-twice.js.