[steps] Expand local actions at parse time

[sswrk]

Why

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How

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Test Plan

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[linear-code]

ENG-22387

[sswrk]

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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
• [steps] Expand local actions at parse time #3929 👈 (View in Graphite)
• [eas-build-job] Add local action schema and utils #3928
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[codecov]

Codecov Report

❌ Patch coverage is 94.69697% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.55%. Comparing base (d1bbabd) to head (92fe812).

Files with missing lines	Patch %	Lines
packages/steps/src/utils/actionInterpolation.ts	90.25%	8 Missing ⚠️
packages/steps/src/ActionExpander.ts	97.21%	3 Missing and 1 partial ⚠️
packages/steps/src/StepsConfigParser.ts	94.12%	1 Missing ⚠️
packages/steps/src/utils/step.ts	92.31%	1 Missing ⚠️

Additional details and impacted files

@@                                     Coverage Diff                                      @@
##           szymonswierk/eng-22387-eas-build-job-local-action-schema    #3929      +/-   ##
============================================================================================
+ Coverage                                                     59.34%   59.55%   +0.22%     
============================================================================================
  Files                                                           936      939       +3     
  Lines                                                         41179    41425     +246     
  Branches                                                       8677     8753      +76     
============================================================================================
+ Hits                                                          24433    24667     +234     
- Misses                                                        16652    16663      +11     
- Partials                                                         94       95       +1     

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[github-actions]

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