Fix CI: Remove unavailable junit logger

The junit logger requires a separate NuGet package that isn't installed.
Since we only need coverage reporting (not test results), remove:
- junit logger from test command
- codecov-cli installation step
- test results upload step

Coverage reporting via codecov-action@v5 is sufficient.

Author: ANcpLua

.github/workflows/tests.yml

@@ -45,7 +45,6 @@ jobs:
             --configuration Release \
             --framework net9.0 \
             --collect:"XPlat Code Coverage" \
-            --logger:"junit;LogFilePath=test-results.xml" \
             --results-directory ./coverage
 
       - name: Upload coverage to Codecov
@@ -54,13 +53,3 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ./coverage/**/coverage.cobertura.xml
           fail_ci_if_error: false
-
-      - name: Install codecov-cli
-        run: pip install codecov-cli
-
-      - name: Upload test results to Codecov
-        run: |
-          codecovcli do-upload \
-            --report-type test_results \
-            --file coverage/test-results.xml \
-            --token ${{ secrets.CODECOV_TOKEN }}