dev/ci: roll all QA pipelines into one
Created by: bobheadxi
It's a bit frustrating to jump back and forth between 5 pipelines: sourcegraph, sourcegraph-async, qa, e2e, codeintel-qa (when that was enabled), and more (updater pipelines??)
qa, e2e, codeintel-qa all do pretty similar things (vagrant -> test), get triggered at the same point, and are all defined outside the pipeline generator as async pipelines. This change brings them all under the same roof for easier management (qa pipeline)