additional metric names should not include objective metric name

[henrysecond1]

What this PR does / why we need it:

Please see #1873 for detailed explanation

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 #1873

Checklist:

• Docs included if any changes are user facing

[aws-kf-ci-bot]

Hi @henrysecond1. Thanks for your PR.

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[coveralls]

Coverage increased (+0.02%) to 73.948% when pulling 4009824 on henrysecond1:objective-name-validation into 502695a on kubeflow:master.

[johnugeorge]

Thanks!

/lgtm

[tenzen-y]

Thanks for this improving @henrysecond1 !
/ok-to-test
/lgtm

[johnugeorge]

/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: henrysecond1, johnugeorge

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[henrysecond1]

@tenzen-y @johnugeorge Thank you for the quick review