[BUG] Garbage collector for cilium/state/ip/v1/<cluster>/<ip>

[issue-account]

Describe the bug

I noticed netreap don't delete old ip that doesn't exist

Steps to reproduce the behavior:

1. Create new service in nomad
2. Check kv cilium/state/ip/v1/<cluster>/<ip>
3. See error

Expected behavior

Old endpoint will be deleted

Environment (please complete the following information)

• Arch: Linux host 5.10.0-27-amd64 #1 SMP Debian 5.10.205-2 (2023-12-31) x86_64 GNU/Linux
• Netreap version: 0.2.0

If you ran into this issue while developing a feature for Netreap:

• Output of cilum version e.g.:

  $ cilium version
  Client: 1.15.3 22dfbc58 2024-03-26T11:45:10+01:00 go version go1.21.8 linux/amd64
  Daemon: 1.15.3 22dfbc58 2024-03-26T11:45:10+01:00 go version go1.21.8 linux/amd64

• Output of nomad version e.g.:

  $ nomad version
  Nomad v1.5.7