feat: Implement diff fingerprint caching for pull request analysis

[rostilos]

• Added DiffFingerprintUtil to compute a stable fingerprint for code changes in pull requests.
• Enhanced PullRequestAnalysisProcessor to utilize commit hash and diff fingerprint caches for reusing analysis results.
• Updated CodeAnalysis model to include a diff_fingerprint field for storage.
• Modified CodeAnalysisService to support retrieval and cloning of analyses based on diff fingerprints and commit hashes.
• Added database migrations to introduce the diff_fingerprint column and create necessary indexes.
• Improved error handling and logging in various components, including file existence checks in Bitbucket Cloud.
• Refactored tests to accommodate new functionality and ensure coverage for caching mechanisms.

[rostilos]

/codecrow analyze

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/CA-10-commit-based-analysis-binding

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