Fix iOS Codegen fallback for libraries without an iOS config

[RealBhupesh]

Summary

• Keep component libraries in the iOS third-party component crawl even when their Codegen config has no ios block.
• Add a regression test covering a component library without iOS configuration.

Changelog:

[IOS] [FIXED] - iOS Codegen now discovers third-party component libraries without an iOS configuration.

Fixes #55308

Test plan

• Targeted Jest test passes:
  yarn jest packages/react-native/scripts/codegen/__tests__/generate-artifacts-executor-test.js --runInBand --testNamePattern="crawls component libraries without an iOS config"
• The full test file executes all 44 tests successfully, but Jest exits from an existing Node 26 cleanup-hook incompatibility with fs.rmdirSync(..., {recursive: true}).

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[RealBhupesh]

Hi React Native maintainers, I’ve completed the Meta CLA for this contribution. This PR is ready for review when convenient. It includes a regression test covering component libraries without an iOS Codegen config. Thank you!

[RealBhupesh]

signed it

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