test: replacce floss with vitest

[luzhuang]

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• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

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Summary by CodeRabbit

• New Features

  • Transitioned to the Vitest testing framework for improved testing capabilities across multiple test files.
  • Introduced a new configuration file for Vitest to enhance project-specific testing setups.
  • Added a new coverage script for streamlined testing and coverage reporting.
  • Enhanced CI workflow with Cypress test integration and improved artifact handling for test failures.

• Bug Fixes

  • Corrected indentation in CI workflow configuration for better clarity.

• Chores

  • Removed unused dependencies and streamlined the testing framework setup by eliminating unnecessary imports.
  • Updated test scripts in package.json to simplify coverage reporting and improve consistency in testing practices.
  • Transitioned file handling in tests to asynchronous operations for improved performance.