drop stackdriver metrics and tracing exporters#2183

Merged

knative-prow-robot merged 8 commits intoknative:mainfrom dprotaso:no-stack-driver

Jul 14, 2021

+156-96,742

Commits on Jul 7, 2021

drop stack driver as a tracing backend
dprotaso
committed

Commits on Jul 8, 2021

Commits on Jul 12, 2021

drop further references to stack driver
dprotaso
committed

Commits on Jul 14, 2021