Find Xcode 27 location with spotlight (CI)

[swhitty]

Updates Xcode 27 CI job to locate Xcode beta using spotlight — this should be more resilient to future beta's and releases over the next couple of months

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.00%. Comparing base (cf3a048) to head (6a6dc11).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #236      +/-   ##
==========================================
+ Coverage   92.98%   93.00%   +0.02%     
==========================================
  Files          72       72              
  Lines        3748     3748              
==========================================
+ Hits         3485     3486       +1     
+ Misses        263      262       -1     

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