[eas-cli] Add prebuild fallback regression tests

[brentvatne]

Why

EAS CLI has a bundled @expo/prebuild-config fallback for iOS entitlement introspection when Expo is unavailable or the project-local Expo CLI fails. A dependency bump can silently make that fallback require Expo and substantially expand published installs.

How

Add regression coverage that verifies:

• the bundled fallback works when Expo is not installed;
• the fallback works after the local Expo CLI fails;
• build-profile environment variables are visible during introspection and restored afterward;
• the bundled prebuild package does not declare Expo as a required peer dependency.

Test Plan

• yarn workspace eas-cli test src/project/ios/__tests__/entitlements-test.ts --runInBand --watchman=false (3 tests)
• yarn workspace eas-cli typecheck

Stack

1. #4281 — minizlib 3.1.0
2. #4282 — uuid v11
3. #4283 — remove lodash.get
4. #4284 — local-build @expo/bunyan
5. #4285 — prebuild fallback regression tests

This final stack item is regression coverage only; it does not change a dependency.

[github-actions]

Subscribed to pull request

File Patterns	Mentions
packages/eas-cli/**	@douglowder

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[github-actions]

✅ Thank you for adding the changelog entry!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.19%. Comparing base (34af071) to head (c004756).

Additional details and impacted files

@@                        Coverage Diff                        @@
##           brent/local-build-expo-bunyan    #4285      +/-   ##
=================================================================
+ Coverage                          64.14%   64.19%   +0.05%     
=================================================================
  Files                               1046     1046              
  Lines                              48101    48101              
  Branches                           10151    10151              
=================================================================
+ Hits                               30851    30872      +21     
+ Misses                             17134    17113      -21     
  Partials                             116      116              

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