[WIP] Fix utils for code analysis and test generation

[Copilot]

• Understand the feedback and analyze the code
• Add JSDoc comments to all exported functions in src/utils.js
  • analyzeFileContent
  • extractFunctions
  • extractClasses
  • extractImports
  • calculateComplexity
  • getTestExtension
  • generateEnhancedTestTemplate
  • generateJestTemplate
  • generateVitestTemplate
  • generateMochaTemplate
• Validate changes
• Run code review
• Reply to comment

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