fix: Throw when config file does not exist

[kongmoumou]

Currently, if provide a non-existent config file(like typo or something else), it would fallback to default config and may throw some misleading err. Maybe we should handle this case and abort it explicitly.

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[aklinker1]

Thanks! Will merge once checks pass

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commit: 23a01d3

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.27%. Comparing base (5d991ed) to head (23a01d3).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1156      +/-   ##
==========================================
- Coverage   82.34%   82.27%   -0.07%     
==========================================
  Files         127      127              
  Lines        6767     6770       +3     
  Branches     1133     1152      +19     
==========================================
- Hits         5572     5570       -2     
- Misses       1181     1186       +5     
  Partials       14       14              

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[aklinker1]

Released in https://github.com/wxt-dev/wxt/releases/tag/wxt-v0.19.14