### _Why are the changes needed?_
Seems there is some delay for the finally block.
<img width="749" alt="image" src="https://user-images.githubusercontent.com/6757692/199627847-7555a2d6-044f-4e91-88f7-6353084c788a.png">
Add a new metrics for opened metadata requests to track after each test.
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [x] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#3748 from turboFei/flaky_test_metadata_requests_v2.
Closes#3748
c130b6e9 [Fei Wang] 1.6.1
bc327752 [Fei Wang] Add kyuubi.metadata.request.opened to fix flaky test
6153f9a6 [Fei Wang] Revert "fix flaky test"
f067c5aa [Fei Wang] fix flaky test
Authored-by: Fei Wang <fwang12@ebay.com>
Signed-off-by: Fei Wang <fwang12@ebay.com>
6de2f68713
