Rewrite the CLI downloads server into GOlang

Currently our server that is serving the CLI artifacts is written in Python. We need to rewrite it into GO for better maintainance.

Server - https://github.com/openshift/console-operator/blob/master/bindata/assets/deployments/downloads-deployment.yaml#L71-L184

There is a bug behind this story: https://bugzilla.redhat.com/show_bug.cgi?id=2034094

AC:

• Rewrite the server that serves the CLI artifacts into GOlang, as part of the console binary. Bridge will run the downloads server in a goroutine. Downalods server should be getting the cli-artifacts from the cli-artifacts image, which will be running in the same pod as a sidecar
• In console-operator repository:
  • Remove the downloadsdeployment controller
  • Remove the downloads-deployment.yaml manifest from bindata assets.
  • Update the service route bindata to point to the console pod and to the downloads server.
  • Update console-deployment.yaml manifest to start the cli-artifatcs image as a sidecar (initContainer)
  • Update unit test