Fix #13885 (Make sarif output compliant with SonarQube) (danmar#7553)

Add `defaultConfiguration.level` to rules in SARIF output, and a
corresponding test in `test/cli/helloworld_test.py`. Fixes #13885.
Tested with SonarQube Community Build, Release 25.5.0.107428.

Author: glankk

cli/cppcheckexecutor.cpp

@@ -120,6 +120,10 @@ namespace {
                         properties["tags"] = picojson::value(tags);
                     }
                     rule["properties"] = picojson::value(properties);
+                    // rule.defaultConfiguration.level
+                    picojson::object defaultConfiguration;
+                    defaultConfiguration["level"] = picojson::value(sarifSeverity(finding));
+                    rule["defaultConfiguration"] = picojson::value(defaultConfiguration);
 
                     ret.emplace_back(rule);
                 }

test/cli/helloworld_test.py

@@ -376,6 +376,7 @@ def test_sarif():
     assert res['runs'][0]['tool']['driver']['rules'][0]['properties']['security-severity'] > 9.5
     assert 'security' in res['runs'][0]['tool']['driver']['rules'][0]['properties']['tags']
     assert re.match(r'[0-9]+(.[0-9]+)+', res['runs'][0]['tool']['driver']['semanticVersion'])
+    assert 'level' in res['runs'][0]['tool']['driver']['rules'][0]['defaultConfiguration'] # #13885
 
 
 def test_xml_checkers_report():