docs(plugin-esbuild): rm esbuild pure setting

[Map1en]

resolve #6422

Checklist

• npm test passes
• tests are included
• documentation is changed or added
• commit message follows commit guidelines

Description of change

esbuild-loader没有pure字段的配置。
https://github.com/privatenumber/esbuild-loader

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View rendered docs/plugins/plugin-esbuild.md
View rendered docs/plugins/plugin-esbuild.zh-CN.md

[codecov]

Codecov Report

Merging #6425 (35a7407) into master (48c2a15) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6425   +/-   ##
=======================================
  Coverage   84.73%   84.73%           
=======================================
  Files         157      157           
  Lines        3564     3564           
  Branches      974      974           
=======================================
  Hits         3020     3020           
  Misses        534      534           
  Partials       10       10           

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[ycjcl868]

这个配置是 esbuild 下的 https://esbuild.github.io/api/#pure

[Map1en]

这个配置是 esbuild 下的 https://esbuild.github.io/api/#pure

是这样的，但plugin-esbuild用的eslint-loader里用不了这个配置，不是直接转成esbuild的配置，所以会报错。