In tests, skip Babel on node_modules when not down leveling

[andrewiggins]

Local tests run a lot faster now since we aren't running babel on all of React DOM

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Size Change: 0 B

Total Size: 79.7 kB

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `docs/dist/assets/client.********.js` | 46.7 kB | | `docs/dist/assets/index.********.js` | 833 B | | `docs/dist/assets/jsxRuntime.module.********.js` | 281 B | | `docs/dist/assets/preact.module.********.js` | 4.02 kB | | `docs/dist/assets/signals-core.module.********.js` | 1.46 kB | | `docs/dist/assets/signals.module.********.js` | 2.02 kB | | `docs/dist/assets/style.********.js` | 21 B | | `docs/dist/assets/style.********.css` | 1.21 kB | | `docs/dist/basic-********.js` | 244 B | | `docs/dist/demos-********.js` | 3.35 kB | | `docs/dist/nesting-********.js` | 1.13 kB | | `docs/dist/react-********.js` | 238 B | | `packages/core/dist/signals-core.js` | 1.54 kB | | `packages/core/dist/signals-core.mjs` | 1.56 kB | | `packages/preact/dist/signals.js` | 1.27 kB | | `packages/preact/dist/signals.mjs` | 1.22 kB | | `packages/react-transform/dist/signals-*********.js` | 3.52 kB | | `packages/react-transform/dist/signals-transform.mjs` | 2.84 kB | | `packages/react-transform/dist/signals-transform.umd.js` | 3.64 kB | | `packages/react/dist/signals.js` | 1.35 kB | | `packages/react/dist/signals.mjs` | 1.29 kB |

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