fix: read keywords from package.json during transition

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: keywords are not inferred from existing package.json #2094
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Removes the removal & flat-mapping from spaces because keywords actually can have spaces in them. CLI folks will have to specify them individually.

🎁

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.82%. Comparing base (fd87ae8) to head (4eb149a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2105   +/-   ##
=======================================
  Coverage   99.82%   99.82%           
=======================================
  Files         126      127    +1     
  Lines        5197     5207   +10     
  Branches      358      359    +1     
=======================================
+ Hits         5188     5198   +10     
  Misses          9        9           

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[github-actions]

🎉 This is included in version v2.22.8 🎉

The release is available on:

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

Cheers! 📦🚀