Consolidate PR validation into one file with multiple jobs

.github/workflows/validate-pr.yml

@@ -0,0 +1,50 @@
+name: Validate PR
+on:
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  #########################################################################
+  build-and-test:
+    runs-on: windows-latest
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v4
+      with:
+        # GitHelper unit test requires full clone, not the shallow default of GitHub Actions
+        fetch-depth: 0
+
+    - name: Setup dotnet
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: '3.1.x'
+
+    - name: Show dotnet info
+      run: dotnet --info
+
+    - name: Build and Test
+      # NoFormat because there is a separate format check action below
+      run: ./BuildAndTest.cmd -NoFormat
+
+  #########################################################################
+  build-multitool-for-npm:
+    runs-on: windows-latest
+    steps:
+    - name: Checkout out code
+      uses: actions/checkout@v4
+
+    - name: Build Multitool for npm
+      run: ./scripts/BuildMultitoolForNpm.ps1
+
+  #########################################################################
+  check-format:
+    runs-on: windows-latest
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v2
+
+    - name: Install format tool
+      run: dotnet tool install -g dotnet-format
+
+    - name: dotnet format
+      run: dotnet-format --folder --check --exclude .\src\Sarif\Autogenerated\