fix(plugin): mini-css-extract-plugin with speed measure

[fz6m]

fix #9897

解决 mini-css-extract-plugin 在和 speed measure 插件一起用会保存的问题。

FYI ：

• "You forgot to add 'mini-css-extract-plugin' plugin" stephencookdev/speed-measure-webpack-plugin#167 (comment)

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated
umi	⬜️ Ignored (Inspect)		Nov 30, 2022 at 10:57AM (UTC)

[codecov]

Codecov Report

Base: 29.23% // Head: 29.22% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (c49ffd4) compared to base (12d57ef).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9907      +/-   ##
==========================================
- Coverage   29.23%   29.22%   -0.02%     
==========================================
  Files         429      429              
  Lines       12241    12247       +6     
  Branches     2933     2937       +4     
==========================================
  Hits         3579     3579              
- Misses       8098     8103       +5     
- Partials      564      565       +1     

Impacted Files	Coverage Δ
packages/bundler-webpack/src/config/config.ts	72.65% <ø> (ø)
...er-webpack/src/config/speedMeasureWebpackPlugin.ts	41.17% <0.00%> (-22.46%)	⬇️

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[PeachScript]

+1