[2.3.0] Checkmk Werk 16158 created: Bi: Creating a bi aggregation with an unknown pack_id now returns a proper 404 response

Title: Bi: Creating a bi aggregation with an unknown pack_id now returns a proper 404 response Class: fix Compatible: compat Component: rest-api Date: 1698410083 Edition: cre Level: 1 Version: 2.3.0b1 When creating a bi aggregation with an unknown pack_id would result in a 500 status code. We now return a proper 404 response.