Fix test_utlization_hold test

[SangJunBak]

Doesn't get to the root cause but fixes the flake for the most part. Not sure if we should track a followup issue or if we should reject this PR.

Context:

• Set the test timeout from 2 minutes to 10 minutes
• Was able to get it to reproduce locally but would take 1-3 hours each time. All test logs would not have the since advance to

Motivation

Fixes https://github.com/MaterializeInc/database-issues/issues/8491

Tips for reviewer

Checklist

• This PR has adequate test coverage / QA involvement has been duly considered. (trigger-ci for additional test/nightly runs)
• This PR has an associated up-to-date design doc, is a design doc (template), or is sufficiently small to not require a design.
• If this PR evolves an existing $T ⇔ Proto$T mapping (possibly in a backwards-incompatible way), then it is tagged with a T-proto label.
• If this PR will require changes to cloud orchestration or tests, there is a companion cloud PR to account for those changes that is tagged with the release-blocker label (example).
• If this PR includes major user-facing behavior changes, I have pinged the relevant PM to schedule a changelog post.