Add macOS ARM64 pipeline for webgpu (microsoft#24060)

### Description

Add macOS ARM64 pipeline for webgpu.

This pipeline is a temporary one. I created this pipeline because the
current code already fails on macOS ARM64 for WebGPU EP. Adding this
pipeline allows to check the status of the fix, and eventually when the
build passes, this pipeline will be merged with the existing macOS arm64
pipeline.

Author: fs-eire

.github/workflows/mac.yml

@@ -154,6 +154,46 @@ jobs:
           --use_xnnpack \
           --use_binskim_compliant_compile_flags
 
+  ARM64-Xcode16-webgpu:
+    runs-on: macos-15
+
+    env:
+      xcode_version: 16
+
+    timeout-minutes: 60
+
+    steps:
+    - uses: actions/setup-python@v5
+      with:
+        python-version: ${{ env.python_version }}
+
+    - name: Verify ARM64 machine
+      shell: python
+      run: |
+        import platform
+        assert platform.machine() == "arm64", "This job expects to be run on an ARM64 machine."
+
+    - name: Use Xcode ${{ env.xcode_version }}
+      shell: bash
+      run: |
+        XCODE_DEVELOPER_DIR="/Applications/Xcode_${{ env.xcode_version }}.app/Contents/Developer"
+        sudo xcode-select --switch "${XCODE_DEVELOPER_DIR}"
+
+    - uses: actions/checkout@v4
+
+    - name: Build and test
+      shell: bash
+      run: |
+        python ./tools/ci_build/build.py \
+          --build_dir ./build \
+          --update \
+          --build --parallel \
+          --test \
+          --build_shared_lib \
+          --build_nodejs \
+          --use_webgpu \
+          --use_binskim_compliant_compile_flags
+
   ARM64-Xcode16-targeting-iphonesimulator:
     runs-on: macos-15