feat(externals): apply production condition to package.exports

[pi0]

🔗 Linked issue

resolves #844

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Rewrite package.json with production condition in exports field before writing to be consistent with the condition of resoluton before. Tested against two linked packages.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[danielroe]

Nice. 👌

[codecov]

Codecov Report

Merging #867 (97953c6) into main (a5586f8) will decrease coverage by 0.07%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##             main     #867      +/-   ##
==========================================
- Coverage   67.20%   67.14%   -0.07%     
==========================================
  Files          59       59              
  Lines        5797     5816      +19     
  Branches      617      624       +7     
==========================================
+ Hits         3896     3905       +9     
- Misses       1893     1903      +10     
  Partials        8        8              

Impacted Files	Coverage Δ
src/rollup/plugins/externals.ts	93.56% <95.83%> (-1.07%)	⬇️
src/presets/edgio.ts	5.55% <0.00%> (-1.86%)	⬇️
src/rollup/config.ts	92.12% <0.00%> (-0.47%)	⬇️

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