[WasmFS] Make the Node backend optional for web builds#26608

kleisauke merged 8 commits intoemscripten-core:mainemscripten-core/emscripten:mainfrom

kleisauke:wasmfs-allow-node-backend-on-webkleisauke/emscripten:wasmfs-allow-node-backend-on-webCopy head branch name to clipboard