CVE-2022-28140: XXE vulnerability in Jenkins Flaky Test Handler Plugin

The commit diff shows critical security features were added to the SAXReader in FlakySuiteResult.parse(): disallow-doctype-decl, and disabling external entities. The absence of these configurations in vulnerable versions directly allows XXE exploitation. The method's purpose (XML parsing of test reports) and the patched fixes align with XXE mitigation patterns. FlakyTestResult.java changes only reflect exception handling updates due to the new security checks, not the vulnerability itself.