Automatic merge from submit-queue (batch tested with PRs 53978, 54008, 53037). 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>.

Fix expected result in Custom Metrics - Stackdriver Adapter e2e test

**What this PR does / why we need it**:
This PR fixes a bug in e2e tests for Custom Metrics - Stackdriver Adapter

**Release note**:
```release-note
NONE
```