Fix warnings-ng extension

[ErikRehmTT]

Describe the bug

While reproducing #618 we figured out, that even the actual described issue was solved by the not yet released changes of #696 the integration with warnings-ng still did not work.
When using the latest master artifact the following error is printed in the log:

[TT] INFO: -> Recording project checks as Warnings NG issues...
[TT] ERROR: Could not invoke Warnings NG recorder: io.jenkins.plugins.analysis.core.steps.IssuesRecorder.perform(hudson.model.Run,hudson.FilePath,hudson.model.TaskListener,io.jenkins.plugins.util.StageResultHandler)
[TT] ERROR: Executing project failed!

To Reproduce

See #618 but use the latest master artifact

Acceptance Criteria

• the warnings-ng extension works as intended with the latest version of the warnings-ng plugin
• the supported versions of the warnings-ng plugin are documented
• integration tests got extended

Versions

• Jenkins: 2.452.3
• Plugins:
  • ecutest: 2.45-SNAPSHOT (latest master)
  • warnings-ng: 11.4