fix: improve migration owner replacements

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: Migrating a non-JoshuaKGoldberg repo creates the wrong owners for JoshuaKGoldberg actions #1043
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Uses a to callback to determine whether to swap out owner to options.owner in "JoshuaKGoldberg" (always) or "JoshuaKGoldberg/..." (if the ... is options.repository).

Also fixes some existing edge cases around owner replacements:

• Syncs up the end-of-readme attribution notice so there's only one place it's written in the templates
• Uses options.owner and options.repository in createDotGitHubFiles instead of hardcoding JoshuaKGoldberg/create-typescript-app.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (df82c12) 92.83% compared to head (dcc76b2) 94.20%.

Files	Patch %	Lines
src/steps/updateLocalFiles.ts	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1078      +/-   ##
==========================================
+ Coverage   92.83%   94.20%   +1.36%     
==========================================
  Files          96       97       +1     
  Lines        5571     5609      +38     
  Branches      438      455      +17     
==========================================
+ Hits         5172     5284     +112     
+ Misses        398      324      -74     
  Partials        1        1              

Flag	Coverage Δ
create	70.36% <30.61%> (-0.28%)	⬇️
initialize	42.18% <87.75%> (+0.34%)	⬆️
migrate	69.83% <69.38%> (?)
unit	72.14% <81.63%> (+0.08%)	⬆️

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[github-actions]

🎉 This is included in version v1.49.1 🎉

The release is available on:

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

Cheers! 📦🚀