fix(auto-imports): Don't add imports to node_module dependencies

[aklinker1]

Node modules are already bundled and ready to go, imports should never be added. It seems like this could be caused by several issues with unimport, but those only really happen inside node_modules.

• Auto-import fails when a identifier is the same as a name to be imported unjs/unimport#270
• Identifier already declared error unjs/unimport#223

This closes #246

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[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (762ba00) 64.30% compared to head (4e2c09e) 64.28%.

Files	Patch %	Lines
src/core/vite-plugins/unimport.ts	66.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #247      +/-   ##
==========================================
- Coverage   64.30%   64.28%   -0.03%     
==========================================
  Files          76       76              
  Lines        6024     6029       +5     
  Branches      487      488       +1     
==========================================
+ Hits         3874     3876       +2     
- Misses       2113     2116       +3     
  Partials       37       37              

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