fix(ssr): corejs polyfill not available in nodejs

[fz6m]

去掉 <TestBrowser /> 的 polyfill 。

原因

<TestBrowser /> 带来了一个 ./core/polyill 的入口，导致 ssr 在开发时会把这部分 corejs 的 polyfill 打包进去。

但是 core-js 含有在 nodejs 里无法使用的 polyfill （这里是 core-js/modules/web.dom-exception.stack.js ），导致 ssr 没法用了，类似的问题见 vuejs/vuepress#3065 。

另外 <TestBrowser /> 在本地 nodejs 里测试用，不需要 polyfill 。

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Name	Status	Preview	Updated
umi	⬜️ Ignored (Inspect)		Dec 30, 2022 at 6:19AM (UTC)

[codecov]

Codecov Report

Base: 29.87% // Head: 29.87% // No change to project coverage 👍

Coverage data is based on head (ed218d9) compared to base (2c360ad).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10184   +/-   ##
=======================================
  Coverage   29.87%   29.87%           
=======================================
  Files         432      432           
  Lines       12410    12410           
  Branches     2974     2974           
=======================================
  Hits         3708     3708           
  Misses       8136     8136           
  Partials      566      566           

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