Flaky Test: MetadataManagerSuite - metadata request metrics

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Describe the flaky test

MetadataManagerSuite:

- metadata request metrics *** FAILED ***
  2 did not equal 1 (MetadataManagerSuite.scala:127)

Actions URL

https://github.com/apache/incubator-kyuubi/runs/7738368898?check_suite_focus=true

Parent issue

#1733

Are you willing to submit PR?

• [ ] Yes I am willing to submit a PR!