Fix reportNameSuffix in XML testcase classname

[goutamadwant]

Fixes #3210

Summary

This preserves reportNameSuffix on the XML <testcase classname="..."> attribute when Surefire falls back from a missing qualified source name to the report source text.

The XML reporter already applies the suffix when a qualified source name is available. The missing case was the fallback path, where sourceText was returned without applying the configured suffix.

Changes

• apply reportNameSuffix consistently through WrappedReportEntry#getSourceQualifiedName
• add focused unit coverage for the fallback path
• add an integration test fixture that verifies the generated XML report contains the suffix in both the test suite name and testcase classname

Verification

• mvn -pl maven-surefire-common -Dtest=WrappedReportEntryTest,StatelessXmlReporterTest test
• mvn -pl maven-surefire-common -DskipTests -Dinvoker.skip=true install
• mvn -pl surefire-its -P run-its -Dit.test=Surefire3210ReportNameSuffixIT -Dits.forkCount=1 -Dinvoker.skip=true verify
• mvn -pl surefire-its -am -DskipTests -Dinvoker.skip=true install
• mvn clean install
• mvn -Prun-its clean install
• git diff --check

Checklist

• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Run mvn clean install to make sure basic checks pass. A more thorough check will be performed on your pull request automatically.
• You have run the integration tests successfully (mvn -Prun-its clean install).
• I hereby declare this contribution to be licenced under the Apache License Version 2.0, January 2004.