bench: update main_html extractor

[e06084]

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Motivation

Please describe the motivation of this PR and the goal you want to achieve through this PR.

Modification

1. bench测试过程提取main_html的逻辑修正为直接调用_extract_main_html方法，同时优化了一些run.py的代码；

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:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@            Coverage Diff             @@
##              dev     #318      +/-   ##
==========================================
- Coverage   89.96%   88.48%   -1.49%     
==========================================
  Files          82       94      +12     
  Lines        5581     6400     +819     
==========================================
+ Hits         5021     5663     +642     
- Misses        560      737     +177     

see 11 files with indirect coverage changes

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