chore: Fix metrics visualization v2 sample

[rimolive]

Description of your changes:
Fixes: #10208

Fix visualization metrics v2 sample

Checklist:

• The title for your pull request (PR) should follow our title convention. Learn more about the pull request title convention used in this repository.

[rimolive]

/retest

[rimolive]

/retest

[connor-mccarthy]

Thanks, @rimolive!

/ok-to-test

[google-oss-prow]

@rimolive: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
kubeflow-pipelines-samples-v2	f46bd85	link	false	/test kubeflow-pipelines-samples-v2

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[connor-mccarthy]

Thanks, @rimolive!
/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: connor-mccarthy

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• samples/OWNERS [connor-mccarthy]

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[connor-mccarthy]

Manually merging since sample failures are independent of your changes.