Add docker-tests coverage of metrics export#5030

tammy-baylis-swi wants to merge 4 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-python:mainfrom

tammy-baylis-swi:add-docker-tests-metrics-exporttammy-baylis-swi/opentelemetry-python:add-docker-tests-metrics-exportCopy head branch name to clipboard