Update default file types for Snippets 5000 (dotnet#41880)

Author: gewarren

.github/workflows/snippets5000.yml

@@ -60,5 +60,7 @@ jobs:
     - name: Run snippets 5000 for PR
       env:
         GitHubKey: ${{ secrets.GITHUB_TOKEN }}
+        ExtensionsCodeTriggers: .cs;.vb;.fs;.xaml;.razor;.cshtml;.vbhtml;.sln;.csproj;.fsproj;.vbproj;.proj
+        ExtensionsProjects: .sln;.csproj;.fsproj;.vbproj;.proj
       run: |
         dotnet run --project docs-tools/snippets5000/Snippets5000/Snippets5000.csproj -- --sourcepath "${{ github.workspace }}" --pullrequest ${{ github.event.number }} --owner ${{ github.repository_owner }} --repo ${{ github.event.repository.name }}