style: remove dead code

[GauBen]

Description

Found a few files in the test module that we never imported

Checklist

Source code

• I've shared and documented any breaking change
• I've reviewed and updated the jahia-depends

Tests

• I've provided Unit and/or Integration Tests
• I've updated the parent issue with required manual validations

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[Copilot]

Pull Request Overview

This PR removes unused code files from the test module that were never imported elsewhere in the codebase. The cleanup involves removing three utility files related to navigation functionality.

Key Changes:

• Removed unused hooks and helper functions for page navigation
• Eliminated dead code from the test module

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
jahia-test-module/src/hooks/usePageAncestors.ts	Removed unused hook for querying page ancestors via GraphQL
jahia-test-module/src/hooks/useBaseNode.ts	Removed unused hook for determining navigation base node
jahia-test-module/src/helpers/menu.ts	Removed unused helper for building navigation menu structure

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