Remove gitaly-proto/go/helper
We have gitaly/streamio now, which has test coverage.
I also think it's simpler and more flexible to use io.Reader instead of our special io.WriterTo from the helper package.
Edited by Jacob Vosmaer (GitLab)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
We have gitaly/streamio now, which has test coverage.
I also think it's simpler and more flexible to use io.Reader instead of our special io.WriterTo from the helper package.