fix: don't pnpm remove an empty list of packages

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: At least one dependency name should be specified for removal after --mode initialization #724
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Refactors the two existing package removal functions to be just one.

[codecov]

Codecov Report

Merging #727 (53247a5) into main (2b3d05a) will decrease coverage by 0.03%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #727      +/-   ##
==========================================
- Coverage   91.12%   91.10%   -0.03%     
==========================================
  Files          82       82              
  Lines        4000     3990      -10     
  Branches      221      223       +2     
==========================================
- Hits         3645     3635      -10     
  Misses        354      354              
  Partials        1        1              

Flag	Coverage Δ
create	72.78% <16.66%> (+0.03%)	⬆️
initialize	33.50% <83.33%> (-0.20%)	⬇️
migrate	72.88% <16.66%> (+0.03%)	⬆️
unit	36.02% <72.22%> (+0.59%)	⬆️

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Files Changed	Coverage Δ
src/shared/packages.ts	100.00% <100.00%> (ø)
src/steps/finalizeDependencies.ts	100.00% <100.00%> (ø)
src/steps/uninstallPackages.ts	100.00% <100.00%> (ø)

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[github-actions]

🎉 This is included in version v1.29.13 🎉

The release is available on:

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

Cheers! 📦🚀