fix(testing): Stub chrome and browser globals with fakeBrowser automatically

[aklinker1]

Apart of #868. If you're using Vitest, the following code is now ran automatically in a setup file:

wxt/packages/wxt/src/core/builders/vite/plugins/extensionApiMock.ts

Lines 52 to 56 in 4570d23

	import { vi } from 'vitest';
	import { fakeBrowser } from 'wxt/testing';
	vi.stubGlobal("chrome", fakeBrowser);
	vi.stubGlobal("browser", fakeBrowser);

This allows you to use packages that depend on these globals in your tests with zero config.

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[codecov]

Codecov Report

Attention: Patch coverage is 8.33333% with 11 lines in your changes missing coverage. Please review.

Project coverage is 82.24%. Comparing base (2e1bd6e) to head (4570d23).
Report is 5 commits behind head on main.

Files	Patch %	Lines
...src/core/builders/vite/plugins/extensionApiMock.ts	8.33%	11 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #925   +/-   ##
=======================================
  Coverage   82.24%   82.24%           
=======================================
  Files         125      125           
  Lines        6568     6580   +12     
  Branches     1095     1098    +3     
=======================================
+ Hits         5402     5412   +10     
- Misses       1152     1154    +2     
  Partials       14       14           

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