Managed Connector | provide error messages from backend to user

[evegufy]

Current Behavior

Click on connector "Details:

Click on Delete connector

Expected Behavior

Click on connector "Details --> error from backend should be provided to user:
"company 2dc4249f-b5ca-4d42-bef1-7a7a950a4f87 is not provider of connector ad6e9084-5e33-48f9-873d-3e461109928d"

Click on Delete connector --> error from backend should be provided to user:
"Deletion Failed. Connector 5ff1866d-7199-46d4-ad32-91705eb5a3a8 connected to an active offer subscription, ca45ea05-13ba-40b7-9638-9ff2cc678522"

Steps To Reproduce

Detected in 2.3.0-RC4