Remove NUnit console runner from build pipeline

Author: Peter-B-

.github/workflows/dotnet-core.yml

@@ -22,8 +22,6 @@ jobs:
       uses: actions/setup-dotnet@v1
       with:
         dotnet-version: 8.0.x
-    - name: Install NUnit.ConsoleRunner
-      run: nuget install NUnit.ConsoleRunner -Version 3.17.0 -DirectDownload -OutputDirectory .
     - name: Install dependencies
       run: dotnet restore
     - name: Build