fix: Don't use bun to load entrypoint config

[aklinker1]

Apart of #222. Fixes one issue with getting WXT working inside bun.

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[codecov]

Codecov Report

Merging #232 (29ac060) into main (91b28c2) will decrease coverage by 0.11%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #232      +/-   ##
==========================================
- Coverage   64.08%   63.98%   -0.11%     
==========================================
  Files          75       75              
  Lines        5895     5898       +3     
  Branches      474      473       -1     
==========================================
- Hits         3778     3774       -4     
- Misses       2080     2087       +7     
  Partials       37       37              

Files	Coverage Δ
src/core/utils/building/import-entrypoint.ts	50.56% <100.00%> (-6.42%)	⬇️

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