[autolinking] Add ios.includeTestSpecsLocally.

[phoenixisuppose]

Adds includeTestSpecsLocally option to ExpoModuleConfig for ios.

Any module with this config will have the podspec.test_specs included via autolinking when the module path does not include node_modules.

This allows module authors to link tests within their own projects, but avoid linking tests for consumers of their published library.

Why

How

Test Plan

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• Conforms with the Documentation Writing Style Guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).

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