Integrate Codecov for coverage report uploads

Added Codecov upload step for coverage reports.

Author: abeckDev

.github/workflows/dotnet-ci.yml

@@ -29,6 +29,16 @@ jobs:
 
     - name: Test
       run: dotnet test --no-build --configuration Release --verbosity normal --collect:"XPlat Code Coverage" --results-directory ./TestResults
+    
+    - name: Upload coverage reports to Codecov
+      if: matrix.os == 'ubuntu-latest'
+      uses: codecov/codecov-action@v5
+      with:
+        directory: ./TestResults
+        fail_ci_if_error: false
+        verbose: true
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
     - name: Generate Coverage Report
       uses: danielpalme/ReportGenerator-GitHub-Action@5.4.2