ref(client): return cleaner errors

Tweaks to get end to end deployment working

WIP: Fourth round of refactoring for Manager

Fix repo prefix searchbug

fix(manager): add test for getDeployments*

feat(deployment): add describe command to helm cli

fix(validate-go): show the errors gofmt found

Repo name routes, tests and cleanups

Factor expansion service logic as an auxiliary library

fix(manager): add test for listDeploymentsRequestHandler

Rather than just listing files that have errors, this now shows
the diff of what gofmt things should be the case, and what is
the case.