test: fix unit test and make test running serially. (#16525) #16614
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cherry-pick #16525 to release-3.1
What problem does this PR solve?
Issue Number: close #16328
Problem Summary: UT fails. Root cause is running unit test parallelly (some prepare plan cache test.)
What is changed and how it works?
What's Changed: Run test serially.
How it Works:
Related changes
Check List
Tests
Side effects
Release note