feat(esm): Revert #355, #359 and #360

[Tobbe]

Debugging CI issue with web side tests on Windows

If CI passes for this PR, I'll merge it, and then go back to #358 and see if that passes, and then pick up with adding more and more code from #355 as I was doing

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[greptile-apps]

Greptile Summary

This PR reverts substantial ESM (ECMAScript Module) preparation work by removing testing infrastructure, build configurations, and Vite plugins that were recently added in PRs #355, #359, and #360. The changes systematically remove Vitest-based testing utilities and revert back to simpler build processes to address CI failures on Windows.

Key changes include:

1. Testing Infrastructure Removal: Completely removes Vitest-specific testing plugins and configurations from the @cedarjs/testing package, including auto-import plugins, router import transformations, database tracking plugins, and custom Vitest environments. The packages/testing/src/api/vitest/index.ts and packages/testing/src/web/vitest/index.ts files are emptied, removing all plugin exports.

2. Build System Simplification: Reverts complex build logic in packages/testing/build.mts back to simple buildCjs() calls, removing custom esbuild configuration that handled import.meta.glob compatibility for CommonJS builds.

3. Package Configuration Rollback: Removes export paths for vitest-related modules from package.json files, eliminates dependencies like unplugin-auto-import, and removes TypeScript project references between packages to decouple build dependencies.

4. Vite Plugin Cleanup: Removes test-mode functionality from the Cedar Vite plugin, eliminating conditional plugin registration based on test environments and removing imports of testing-related plugins.

5. Mock System Simplification: Reverts MockRouter and MockProviders components to simpler implementations, removing dynamic imports of user routes via globRoutesImporter.ts and falling back to more traditional module alias approaches.

These changes represent a significant rollback of ESM migration work, moving from a sophisticated dual Jest/Vitest testing setup back to a Jest-focused approach. The revert affects the entire testing ecosystem but maintains core functionality while eliminating Windows-specific compatibility issues.

Confidence score: 2/5

• This PR introduces significant risk by removing substantial testing infrastructure without clear replacement mechanisms
• Score reflects the large scope of removed functionality that could break existing test setups and development workflows
• Pay close attention to all testing-related files and ensure adequate testing coverage remains after these removals

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[greptile-apps]

style: Potential issue: files using import.meta.glob in src/web/globRoutesImporter.ts may not work properly in CJS builds without the custom handling that was removed