This is part of #7639.

Expectations

Implement Ivyless publish task, which publishes to a remote Ivy repo.

1. Set up a scripted test such that an Unfiltered http server accepts upload to repo directory. (See https://github.com/eed3si9n/gigahorse/blob/develop/common-test/src/main/scala/gigahorsetest/TestPlan.scala for example)
2. Set up a scripted test such that publish can publish to the said HTTP server.
3. Run scripted test such that when useIvy is set to false it will produce the identical set of files.
4. Support credentials - https://www.scala-sbt.org/1.x/docs/Publishing.html#Credentials

Note

publishTo := Some(Resolver.url("test-repo", new URL("http://localhost:3000/"))(using Resolver.ivyStylePatterns))