Revert "Enable Stryker.NET baseline feature"

This reverts commit 4bc0aa3.

This clears the dashboard on https://dashboard.stryker-mutator.io/reports/github.com/serilog-contrib/serilog-formatting-log4net/main and the mutation score becomes unavailable.

Author: 0xced

.github/workflows/continuous-integration.yml

@@ -76,7 +76,7 @@ jobs:
         run: |
           cd tests
           dotnet tool restore
-          dotnet tool run dotnet-stryker --version ${GITHUB_REF#refs/heads/} --dashboard-api-key ${{ secrets.STRYKER_DASHBOARD_API_KEY }}
+          dotnet tool run dotnet-stryker --reporter dashboard --version ${GITHUB_REF#refs/heads/} --dashboard-api-key ${{ secrets.STRYKER_DASHBOARD_API_KEY }}
       - name: Create NuGet package
         run: dotnet pack --no-build --output .
         id: dotnet-pack