unable to change user's import secret

[KyriosGN0]

Describe the bug

when changing the name of the import secret in a user CR, the message topology update doesn't update the user itself

To Reproduce

Steps to reproduce the behavior:

1. create a user with a import secret (our name was -user-credentials)
2. create a new secret with a required password and username fields
3. change the import secret param in the user cr
4. try to login with the new user, fails

Expected behavior rmq will use the password in the new secret

Version and environment information

• Messaging Topology Operator: [1.15.0]
• RabbitMQ: [e.g. 3.13.7]
• RabbitMQ Cluster Operator: [1.15.0]
• Kubernetes: [1.30.0]
• Cloud provider or hardware configuration: GKE

Additional context

the new secret had more fields then required if that's a problem