Explicitly generate Jacoco reports

I believe the sonar plugin used to do this (or sonarcloud supported the raw jacoco.exec file) but coverage is no longer being reported.

.github/workflows/ci.yml

@@ -30,4 +30,4 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-        run: mvn -B verify org.sonarsource.scanner.maven:sonar-maven-plugin:sonar -P sonarcloud
+        run: mvn -B verify org.jacoco:jacoco-maven-plugin:report org.sonarsource.scanner.maven:sonar-maven-plugin:sonar -P sonarcloud