[build-tools] Load local action catalog at build runtime

[sswrk]

Why

How

Test Plan

[linear-code]

ENG-22387

[sswrk]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• [eas-cli] Validate local actions in workflow files #3931
• [build-tools] Load local action catalog at build runtime #3930 👈 (View in Graphite)
• [steps] Expand local actions at parse time #3929
• [steps] Add local action discovery utilities #3956
• [eas-build-job] Add local action schema #3928
• main

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[codecov]

Codecov Report

❌ Patch coverage is 94.44444% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.58%. Comparing base (4de54ff) to head (a2ee2c3).

Files with missing lines	Patch %	Lines
packages/build-tools/src/steps/actions.ts	93.11%	2 Missing ⚠️

Additional details and impacted files

@@                                         Coverage Diff                                          @@
##           szymonswierk/eng-22387-steps-expand-custom-actions-at-parse-time    #3930      +/-   ##
====================================================================================================
+ Coverage                                                             59.54%   59.58%   +0.04%     
====================================================================================================
  Files                                                                   940      941       +1     
  Lines                                                                 41397    41429      +32     
  Branches                                                               8746     8749       +3     
====================================================================================================
+ Hits                                                                  24646    24680      +34     
+ Misses                                                                16656    16655       -1     
+ Partials                                                                 95       94       -1     

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[github-actions]

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