fix: skip checkout in CTA action before transition step

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: Transition action failing in PRs from fork #2214
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Upstreaming of JoshuaKGoldberg/formatly#122. Previously, the action would only check on step 2 of 3 if it should skip. But step 1 -checkout- requires a token that doesn't exist on fork.

Now, step 1 does the if. No more checking out the repo unnecessarily.

🎁

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.80%. Comparing base (5b171ce) to head (1f75359).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2215   +/-   ##
=======================================
  Coverage   99.80%   99.80%           
=======================================
  Files         134      134           
  Lines        6005     6006    +1     
  Branches      499      499           
=======================================
+ Hits         5993     5994    +1     
  Misses         12       12           

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[github-actions]

🎉 This is included in version v2.41.2 🎉

The release is available on:

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

Cheers! 📦🚀