[eas-cli] Improve build request error details

[szdziedzic]

Why

Build request failures can currently hide useful underlying details when the GraphQL client returns an empty graphQLErrors array. In the reported case, EXPO_DEBUG=1 only surfaced [], while the user-facing error stayed generic despite the HTTP 400 response carrying more context.

How

Updated handleBuildRequestError to preserve existing friendly handling for known server-side EAS error codes, while enriching the generic build request failure path with network error messages, HTTP response status, and request IDs when available.

Also changed debug logging to emit structured build request details, including GraphQL errors, network error fields, response status/url, and selected safe response headers.

Test Plan

• ./node_modules/.bin/oxfmt .
• corepack yarn test src/build/__tests__/handleBuildRequestError-test.ts
• corepack yarn workspace eas-cli typecheck

[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@douglowder
packages/eas-cli/src/build/**	@sjchmiela

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[szdziedzic]

/changelog-entry bug-fix Improve EAS Build request failures to include network and HTTP response details when GraphQL errors are empty.

[codecov]

Codecov Report

❌ Patch coverage is 96.51163% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.41%. Comparing base (081e1a9) to head (6c32f94).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/eas-cli/src/build/build.ts	96.52%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3982      +/-   ##
==========================================
+ Coverage   59.33%   59.41%   +0.08%     
==========================================
  Files         936      936              
  Lines       41172    41258      +86     
  Branches     8671     8699      +28     
==========================================
+ Hits        24424    24508      +84     
- Misses      16654    16656       +2     
  Partials       94       94              

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[github-actions]

✅ Thank you for adding the changelog entry!