refactor: streamline Node.js version management and improve error handling

[Victor1890]

This pull request includes several changes to the NodeVenv class in the src/node/index.ts file, focusing on code simplification and improving the handling of Node.js version management. The most important changes include consolidating command execution logic, refactoring methods for better readability, and updating error handling.

Code simplification and consolidation:

• Consolidated command execution logic for checking if a manager is installed by combining the Windows and non-Windows commands into a single command variable.
• Simplified the runInstallNodeCommand method by combining the Windows and non-Windows commands into installCommand and useCommand variables.

Refactoring for readability:

• Moved the logic for managing Node.js versions into a new private method manageNodeVersion to improve code organization and readability.
• Updated the updateNvmrcFile and installNode methods to use the new manageNodeVersion method, ensuring consistent handling of Node.js version management.

Error handling improvements:

• Improved error messages and logging for better clarity and user guidance, ensuring that users receive more informative feedback when operations fail.