[model server] add metrics smoke tests

[rnetser]

requires RedHatQE/openshift-python-utilities#389

[github-actions]

The following are automatically added/executed:

• PR size label.
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• Run tox

Available user actions:

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Supported labels

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[rnetser]

/wip

[rnetser]

/wip cancel

[rnetser]

due to RHOAIENG-3236 - this cannot be verified, added skip when jira is open