feat: run npm dedupe at end of finalizeDependencies

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🚀 Feature: Run pnpm dedupe at the end of finalizeDependencies #770
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Adds with execaCommand since it's already being used.

[codecov]

Codecov Report

Merging #902 (60f1506) into main (4486186) will increase coverage by 11.37%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main     #902       +/-   ##
===========================================
+ Coverage   82.19%   93.56%   +11.37%     
===========================================
  Files          84       89        +5     
  Lines        4612     4712      +100     
  Branches      214      373      +159     
===========================================
+ Hits         3791     4409      +618     
+ Misses        817      302      -515     
+ Partials        4        1        -3     

Flag	Coverage Δ
create	71.97% <100.00%> (+0.01%)	⬆️
initialize	37.04% <0.00%> (-0.02%)	⬇️
migrate	70.71% <0.00%> (-0.04%)	⬇️
unit	67.16% <100.00%> (?)

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Files	Coverage Δ
src/steps/finalizeDependencies.ts	100.00% <100.00%> (+22.22%)	⬆️

... and 44 files with indirect coverage changes

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[github-actions]

🎉 This is included in version v1.32.0 🎉

The release is available on:

• GitHub releases
• npm package (@latest dist-tag)

Cheers! 📦🚀