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Remove ARCH specific image consideration from e2e tests
Change-Id: I309fec49b030a4d457890f25d2f69e7c641c03fd
**What this PR does / why we need it**:
All e2e test images are now using multi-arch manifests so we should stop
looking up and using images that are specific to runtime.GOARCH
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```