Current behavior
NCMP still gives back error in old format if the dmiPlugin responds with error

500 INTERNAL_SERVER_ERROR
{
    "status": "500 INTERNAL_SERVER_ERROR",
    "message": "404 : \"{\"status\":\"Not Found\",\"message\":\"OPERATION_FAILED\",\"details\":\"Requested resource not found.\"}\"",
    "details": "Check logs for details."
} 

Expected behavior
Based on previous CPS items (CPS-917) and the code, if a DMI plugin responds with an error in case of dmiDataOperations the error returned by NCMP should be in DmiErrorMessageDmiresponse format.

502 Bad Gateway
{
  message: <message>
  "dmi-response":
   {
    "http-code": "404",
    "body": 
     {
     "status":"Not Found",
     "message":"OPERATION_FAILED",
     "details":"Requested resource not found."
     }
   }
}

Reproduction
Send get request on non existing item in a dmiPlugi, where dmiPlugin will respond with 404 http code

<ncmp_url>/ncmp/v1/ch/<cmhandle_id>/data/ds/ncmp-datastore:passthrough-operational?resourceIdentifier=NonExistingItem=NonExistingItem

Or send get request on non available dmiPlugin, where dmiPlugin will respond with 404 http code

<ncmp_url>/ncmp/v1/ch/<cmhandle_id_of_nonresponding_dmi_plugin>/data/ds/ncmp-datastore:passthrough-operational?resourceIdentifier=ExistingItem=ExistingItem

Additional information
NetworkCmProxyRestExceptionHandler would return the correct format if a HttpClientRequestException came from the  NetworkCmProxyDataServiceImpl, but it never gives back an HttpClientRequestException because the restClient  throws HttpStatusCodeException in case of dmiPlugin error responses.
NetworkCmProxyDataServiceImpl tries to check the response code however there is an exception.

Logs
Logs about the exception which should be handled right way, can be found in attachment