Adding test for modelmesh-serving that utilizes the triton servingruntime

[crobby]

Description

Additional test for modelmesh serving that uses the triton servingruntime

modelmesh test suite augmented to include additional test

How Has This Been Tested?

Locally

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[openshift-ci]

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[LaVLaS]

/lgtm