[PR] #2661 Added error message when self registration fails

[via GitHub]

IsaakKrut opened a new pull request, #2873:
URL: https://github.com/apache/streampipes/pull/2873

   ### Purpose
   fixes #2661. 
   UI shows "Internal Server Error" when 500 is returned
   
   
![image](https://github.com/apache/streampipes/assets/25233902/f7712843-be2f-40e3-abed-efba46b9265d)
   
   ### Remarks 
   
   PR introduces (a) breaking change(s): no
   
   PR introduces (a) deprecation(s): no
   


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