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Automatic merge from submit-queue (batch tested with PRs 56858, 57040, 56979, 57051, 57052). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Add e2e test for custom metrics with Prometheus and Stackdriver **What this PR does / why we need it**: Add e2e test for custom metrics in a setup with a container exposing metrics in Prometheus format and prometheus-to-sd sidecar container scraping the metrics and writing them to Stackdriver. Also some test refactoring for adding new tests more easily (plan to add scale down tests and a test with scaling on two metrics). **Release note**: ``` NONE ```