fix: Disable Vite CJS warnings

[aklinker1]

Apart of #277, this just hides the warning. It's still a problem, but the problem is in c12 and jiti, so right now the plan is to wait for them to be fixed.

Check out any of the template jobs from the validate workflow. The npm run build and npm i *.tgz steps should not show the warning anymore.

The original npm i will contain the log because it installs the current production version, which doesn't have this fix.

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Before: https://github.com/wxt-dev/wxt/actions/runs/7306147108/job/19910552197

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After: https://github.com/wxt-dev/wxt/actions/runs/7309075494/job/19916319577

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[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (ad0e8e4) 70.43% compared to head (e352c2d) 70.40%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/cli.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #296      +/-   ##
==========================================
- Coverage   70.43%   70.40%   -0.03%     
==========================================
  Files         134      134              
  Lines        7509     7512       +3     
  Branches      584      584              
==========================================
  Hits         5289     5289              
- Misses       2168     2171       +3     
  Partials       52       52              

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