Add a shorthand for building the view-transition fixture (#32496)

I end up rebuilding for testing the view-transition fixture a lot. It
doesn't need everything that flight needs so this just adds a short hand
that's a little faster to rebuild.

---------

Co-authored-by: Hendrik Liebau <[email protected]>

package.json

@@ -117,6 +117,7 @@
     "build-for-devtools-dev": "yarn build-for-devtools --type=NODE_DEV",
     "build-for-devtools-prod": "yarn build-for-devtools --type=NODE_PROD",
     "build-for-flight-dev": "cross-env RELEASE_CHANNEL=experimental node ./scripts/rollup/build.js react/index,react/jsx,react.react-server,react-dom/index,react-dom/client,react-dom/server,react-dom.react-server,react-dom-server.node,react-dom-server-legacy.node,scheduler,react-server-dom-webpack/ --type=NODE_DEV,ESM_PROD,NODE_ES2015 && mv ./build/node_modules ./build/oss-experimental",
+    "build-for-vt-dev": "cross-env RELEASE_CHANNEL=experimental node ./scripts/rollup/build.js react/index,react/jsx,react-dom/index,react-dom/client,react-dom/server,react-dom-server.node,react-dom-server-legacy.node,scheduler --type=NODE_DEV && mv ./build/node_modules ./build/oss-experimental",
     "linc": "node ./scripts/tasks/linc.js",
     "lint": "node ./scripts/tasks/eslint.js",
     "lint-build": "node ./scripts/rollup/validate/index.js",