exclude coverage check for dashboard (#616)

Author: Yang

sonar-project.properties

@@ -10,3 +10,5 @@ sonar.links.ci=https://github.com/dianna-ai/dianna/actions
 sonar.python.coverage.reportPaths=coverage.xml
 sonar.python.xunit.reportPath=xunit-result.xml
 sonar.python.pylint.reportPaths=pylint-report.txt
+# Exclude test subdirectories from source scope
+sonar.coverage.exclusions = dianna/dashboard/**