sig#882 - Remove deprecated code

[MaximilianHauer]

Description

sig#882 - Remove deprecated code

• The following part should be removed from all the Backend API response

"errors": {
    "Org.Eclipse.TractusX.Portal.Backend.Administration.Service": [
      "connector 5636f9b9-c3de-4ba5-8027-00d17a2fecfb does not exist"
    ]
  },

Acceptance Criteria

• [criteria 1]
• [criteria 2]
• [criteria 3]

Additional Information