Important

This pull request adds comprehensive testing for @solvro/config using vitest, enhances the CLI for non-interactive use, and updates ESLint and Prettier configurations.

• Testing:
  • Adds integration-tests.yml for GitHub Actions to run integration tests on PRs and pushes to main.
  • Introduces vitest for testing with configurations in vitest.config.ts.
  • Adds TestEnvironment class in tests/utils/test-environment.ts for setting up test environments.
  • Implements tests in tests/integration.test.ts, tests/error-conditions.test.ts, and tests/cross-version.test.ts.
• CLI Enhancements:
  • Updates src/cli/index.ts to support non-interactive mode and CLI options for installing tools.
  • Adds polishConfirm and runIfInteractive utilities for handling interactive prompts.
• Configuration:
  • Updates ESLint configurations in src/eslint/configs and presets in src/eslint/presets.
  • Modifies package.json to include new scripts and dependencies for testing and configuration.
  • Updates .node-version to 22.x and modifies README.md to reflect new testing capabilities.

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