Improve setup script with enhanced visual output and comprehensive testing

[uddish]

Closes: https://github.com/intercom/intercom/issues/407144

This pull request aims to significantly improve the user experience of our setup script by providing clearer, more informative, and visually appealing output during the installation process. The enhanced script now offers better progress tracking, error handling, and overall feedback, making it easier for end-users to understand and troubleshoot the setup process if needed.

The changes include the addition of step-by-step progress indicators, a visual progress bar, color-coded output for different types of messages (success, warnings, errors, and info), and timing information for the entire setup process. We've also implemented a more professional layout with structured borders and formatted sections. These improvements will help users better understand what's happening during the setup and provide a more polished experience.

In addition to the visual enhancements, we've added comprehensive test coverage for the setup script. A new test suite in __tests__/setup.test.js now includes 11 test cases that cover all aspects of the improved script, ensuring its functionality, structure, and visual enhancements work as expected. The package.json file has been updated to use the proper Jest test command, and all tests are now passing. These changes will help maintain the script's reliability and make future modifications easier and safer.