Add BS SDK installation

Author: craigfowler

.github/workflows/crossBrowserTesting.yml

@@ -73,6 +73,8 @@ jobs:
           echo '{ "sdk": { "version": "8.0.418", "rollForward": "latestMinor" } }' > global.json
       # - name: Restore .NET packages
       #   run: dotnet restore -p:BrowserStack=true
+      - name: Install BrowserStack SDK
+        run:  dotnet tool install --local browserstack-sdk --version 1.26.0
       - name: Restore Node modules
         run: |
           cd CSF.Screenplay.JsonToHtmlReport.Template/src