[Fix] Fix CI for refactor-metric-loop-and-preprocessor.

[LeoXing1996]

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Motivation

Fix CI for #1656.

Modification

Fix lint, unit test to pass CI.

Who can help? @ them here!

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

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

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with some of those projects.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (refactor-metric-loop-and-preprocessor@be5f5f7). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head 33ddc4d differs from pull request most recent head 4a3c4f6. Consider uploading reports for the commit 4a3c4f6 to get more accurate results

Additional details and impacted files

@@                           Coverage Diff                            @@
##             refactor-metric-loop-and-preprocessor    #1658   +/-   ##
========================================================================
  Coverage                                         ?   88.22%           
========================================================================
  Files                                            ?      399           
  Lines                                            ?    26254           
  Branches                                         ?     4118           
========================================================================
  Hits                                             ?    23163           
  Misses                                           ?     2224           
  Partials                                         ?      867           

Flag	Coverage Δ
unittests	88.22% <0.00%> (?)

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