feat: make model registry namespace different between ODH and downstream

[zdtsw]

Description

we made hardcode name for MR NS when we added it in ODH, this PR is to change it to use different NS for ODH and downstream

ref: https://issues.redhat.com/browse/RHOAIENG-4272

How Has This Been Tested?

Screenshot or short clip

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[zdtsw]

close it in favor of #1221