[Bug] JWK Validator: Executor wird nicht korrekt beendet

Description of the bug:

1. Anwendung wird beendet
2. Child process läuft weiter

Current behavior:

Bei einem Beenden der Anwendung, bleibt ein Unterprozess bestehen.

Expected behavior:

Die Anwendung wird korrekt und komplett heruntergefahren.

Environments:

Additional Information:

Dependency / relationship to other issues:

Responsible person / team:

Team SSP

Contact persons including contact details:

Screenshots / Logs / Requests:

Checklist:

• Add Severity label
• Add team label
• Related/affected issues/stories/epics linked and explained in the bug issue
• Creation of an automated test
• Bugfix deployed on DEV
• Bugfix tested on DEV
• Bugfix deployed on TEST
• Bugfix tested on TEST (possibly also by the connection project itself)
• Successful fix reported to Team Operations (Teams channel)
• Bugfix deployed on STAGE
• Bugfix tested on STAGE if necessary
• Bugfix deployed on PROD
• Bugfix tested on PROD (possibly also by the connection project itself)
• Final communication by Team Operations if necessary
• Internal documentation was checked and updated if necessary
• External documentation has been checked and updated if necessary
• Updated changelog if necessary

Approach/Solution:

Release version of the artifact: