[eas-cli] Validate local composite functions in workflow files

[sswrk]

Why

Workflow users should get early feedback when a workflow references a missing or malformed local composite function before server-side validation runs.

How

• Adds validateWorkflowLocalCompositeFunctionsAsync to walk workflow job steps and build the local composite function catalog using @expo/steps discovery utilities
• Validates referenced composite functions exist on disk, parse as YAML, and conform to CompositeFunctionConfigZ (including nested references)
• Hooks validation into validateWorkflowFileAsync

Test Plan

Added unit tests for validation, monorepo resolution, nested references, and malformed configs.

[linear-code]

ENG-22387

[sswrk]

• [eas-cli] Validate legacy command/path local functions referenced from workflows #4098
• [build-tools] Load legacy command/path local functions and resolve module paths #4097
• [steps] Expand legacy command/path local functions to a single build step #4096
• [eas-build-job] Accept legacy command/path custom function shape in function.yml #4095
• [eas-cli] Validate local composite functions referenced from workflow hooks #4064
• [build-tools] Load composite function catalogs for hook steps #4063
• [steps] Support local composite functions in hook steps #4062
• [steps] Unify the default gating of steps with no if: across steps, composite scopes, and hooks #4061
• [eas-cli] Validate local composite functions in workflow files #3931 👈 (View in Graphite)
• [build-tools] Load local composite function catalog at build runtime #3930
• [steps][4/4] Resolve composite function outputs #4015
• [steps][3/4] Interpolate composite function inputs #4014
• [steps][2/4] Expand composite function references into build steps #3929 : 1 other dependent PR (#4013 )
• [steps][1/4] Add isCompositeFunctionPath and reject local composite functions in custom builds #3956
• [eas-build-job] Add local composite function schema #3928
• main

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[codecov]

Codecov Report

❌ Patch coverage is 87.80488% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.23%. Comparing base (2e00719) to head (ab74d1e).

Files with missing lines	Patch %	Lines
...li/src/commandUtils/workflow/compositeFunctions.ts	92.11%	3 Missing ⚠️
...es/eas-cli/src/commandUtils/workflow/validation.ts	33.34%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3931      +/-   ##
==========================================
+ Coverage   62.20%   62.23%   +0.03%     
==========================================
  Files         994      995       +1     
  Lines       44716    44757      +41     
  Branches     9409     9414       +5     
==========================================
+ Hits        27812    27848      +36     
- Misses      15457    15462       +5     
  Partials     1447     1447              

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[sjchmiela]

Should this be shared across worker and eas-cli somehow? I think I saw a very similar function in another PR just now.

[sswrk]

Same reason as here #3930 (comment) I'm open to moving it a layer lower, to steps if you think that makes sense

[github-actions]

✅ Thank you for adding the changelog entry!