fix(ui): clarify server log to indicate Katib UI is accessible at /katib

[anishbista60]

What this PR does / why we need it:

• This PR is to make a clarity on root path of katib UI so that user donot need to go to code base to see the root path which is /katib

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 #2611

Checklist:

• Docs included if any changes are user facing

[google-oss-prow]

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[anencore94]

Thanks for the clarification :)
/lgtm