Update unittests and npm test

unittest for relaxed SIMD needs node v21 or newer.
Add wasm.relaxedSimd to test-runner-cli-args

Author: jing-bao

cmake/onnxruntime_unittests.cmake

@@ -229,8 +229,12 @@ function(AddTest)
           list(APPEND TEST_NODE_FLAGS "--experimental-wasm-simd")
         endif()
 
+        if (onnxruntime_ENABLE_WEBASSEMBLY_RELAXED_SIMD)
+          message(WARNING "Use system `node` to test Wasm relaxed SIMD. Please make sure to install node v21 or newer.")
+          set(NODE_EXECUTABLE node)
+          set(TEST_NODE_FLAGS)
         # prefer Node from emsdk so the version is more deterministic
-        if (DEFINED ENV{EMSDK_NODE})
+        elseif (DEFINED ENV{EMSDK_NODE})
           set(NODE_EXECUTABLE $ENV{EMSDK_NODE})
         else()
           # warning as we don't know what node version is being used and whether things like the TEST_NODE_FLAGS

js/web/script/test-runner-cli-args.ts

@@ -305,6 +305,10 @@ function parseWasmFlags(args: minimist.ParsedArgs): Env.WebAssemblyFlags {
   if (typeof simd !== 'undefined' && typeof simd !== 'boolean') {
     throw new Error('Flag "wasm.simd"/"wasm-enable-simd" must be a boolean value');
   }
+  const relaxedSimd = (wasm.relaxedSimd = parseBooleanArg(wasm.relaxedSimd));
+  if (typeof relaxedSimd !== 'undefined' && typeof relaxedSimd !== 'boolean') {
+    throw new Error('Flag "wasm.relaxedSimd" must be a boolean value');
+  }
   const proxy = (wasm.proxy = parseBooleanArg(wasm.proxy ?? args['wasm-enable-proxy']));
   if (typeof proxy !== 'undefined' && typeof proxy !== 'boolean') {
     throw new Error('Flag "wasm.proxy"/"wasm-enable-proxy" must be a boolean value');