dominikriemer closed issue #3257: `StreamPipesFunctionHandler` Does Not Clean
Up All Functions on Service Stop
URL: https://github.com/apache/streampipes/issues/3257
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tenthe opened a new issue, #3257:
URL: https://github.com/apache/streampipes/issues/3257
### Body
## Description
The `StreamPipesFunctionHandler` fails to clean up all functions when the
service is stopped. The issue occurs in
`StreamPipesFunctionHandler.cleanupFunctions`, where t