improvement: allow transformedData in hook results

[mangopep]

Description: (required)

• Fixes Feature: Add transformedData to the hook_results #1651.
• Adds an opt-in include_hook_transformed_data config flag.
• Preserves transformedData inside hook_results only when explicitly enabled.
• Keeps existing behavior unchanged by default, so transformed data is still omitted unless opted in.

Validation Screenshots

tests/unit/src/middlewares/hooks/index.test.ts

![hooks-index-test]

tests/unit/src/handlers/services/hooksService.test.ts

![hooks-service-test]

Tests Run/Test cases added: (required)

• Added unit test for default behavior: transformedData is omitted
• Added unit test for opt-in behavior: transformedData is included
• npx jest tests/unit/src/middlewares/hooks/index.test.ts --runInBand
• npx jest tests/unit/src/handlers/services/hooksService.test.ts --runInBand
• npm run format:check
• npm run build

Type of Change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)