feat: Add method to determine CodeQL directory for the action

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[Copilot]

Pull Request Overview

This PR adds a method to determine the appropriate CodeQL directory for the action, with improved path resolution to avoid indexing issues. The change modifies the directory selection logic to use parent directories and canonicalized paths.

• Updates get_codeql_dir() method to use parent of working directory instead of working directory itself
• Adds path canonicalization to resolve symbolic links and relative paths
• Enhances documentation to explain the rationale for using parent directories

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