[Enhancement] Clear UT warning caused by pytest

[zhouzaida]

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Motivation

Clear UT warning caused by pytest. More details at https://docs.pytest.org/en/stable/deprecations.html#support-for-tests-written-for-nose

scikit-learn/scikit-learn#22572

Modification

Replace setup(self) with setup_method(self) and teardown(self) with teardown_method(self).

BC-breaking (Optional)

No

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@b14c179). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head 5d04a88 differs from pull request most recent head 7cd2f4a. Consider uploading reports for the commit 7cd2f4a to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #947   +/-   ##
=======================================
  Coverage        ?   76.64%           
=======================================
  Files           ?      138           
  Lines           ?    10816           
  Branches        ?     2163           
=======================================
  Hits            ?     8290           
  Misses          ?     2170           
  Partials        ?      356           

Flag	Coverage Δ
unittests	76.64% <0.00%> (?)

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