[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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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (brent/local-build-expo-bunyan@acabc8f). Learn more about missing BASE report.

Additional details and impacted files

@@                       Coverage Diff                        @@
##             brent/local-build-expo-bunyan    #4285   +/-   ##
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  Files                                    ?     1050           
  Lines                                    ?    48379           
  Branches                                 ?    10207           
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  Hits                                     ?    31150           
  Misses                                   ?    17113           
  Partials                                 ?      116           

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[github-actions]

✅ Thank you for adding the changelog entry!