[test] Add esm and cjs testing for next-config-ts (#83134)
Split tests into ESM and CJS to ensure it works on both environments.
The changes are mostly:
1. Split tests into two
2. Add `-esm` and `-cjs` for each
3. Add `packageJson: { type: 'module' }` to `-esm` test
4. Renamed `tsconfig.json` -> `tsconfig.test.json`
Added more fixtures to test `import-from-node-modules`.
x-ref: https://github.com/vercel/next.js/pull/83134/files#diff-1a4138af8d7d9ec956653ae76ede7eaa8b1f701931dc302f039fa4e770ef61afR3
