Use patch to change configuration parameters in each trial

[lwangbm]

/kind feature

Describe the solution you'd like
[A clear and concise description of what you want to happen.]
Currently, we delete ML service deployment upon each trial completion, and create a new service deployment (with new parameters) in the next trial. Please change this routine from creation-delete to patch.

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]