Add IP pool info to dropdown when selecting a floating IP to attach to an instance

Right now, the floating IP selector omits any info about the IP Pool the available floating IPs are coming from. It could be useful to have that info available while the user is selecting one to attach.

Currently:
<img width="470" height="404" alt="Image" src="https://github.com/user-attachments/assets/419de793-a28d-4f23-ba89-81a2d71dfdc8" />