Having two AuthProxyWorkload with same selector and same connection string makes the operator fail creation

**Information**:
Having 2 `AuthProxyWorkload` with same selector and same connection string makes the operator fail. This should still work, as there is no conflicting information and allows a smooth rollover.

The question is, how would one handle 2 conflicting ones, but I think this one should not fail, if it's not conflicting information. But I guess this a design choice? Looking forward to your thoughts!

**Version where the error occured**:
1.7.8

**Reproduced on latest version**:
Yes

**Logs / Further Info**:
```
Name: open-webui-pgbouncer-78dd849f95.18c83568c85e5cc4
Namespace: open-webui
Labels:
Annotations:
API Version: events.k8s.io/v1
Deprecated Count: 8
Deprecated First Timestamp: 2026-08-03T05:46:16Z
Deprecated Last Timestamp: 2026-08-03T05:46:21Z
Deprecated Source:
Component: replicaset-controller
Event Time:
Kind: Event
Metadata:
Creation Timestamp: 2026-08-03T05:46:16Z
Resource Version: 1785735981523231007
UID: 68fb8469-a62e-43b2-b1b8-4b340decc481
Note: Error creating: admission webhook "pods.proxy.cloudsql.google.com" denied the request: there is an AuthProxyWorkloadConfiguration error reconciling this workload found 1 configuration errors on workload /v1, Kind=Pod open-webui/: [{PortConflict proxy port 5432 for instance REDACTED:europe-west3:shared-postgres is already in use open-webui-pgbouncer-double open-webui /v1, Kind=Pod open-webui}]
Reason: FailedCreate
Regarding:
API Version: apps/v1
Kind: ReplicaSet
Name: open-webui-pgbouncer-78dd849f95
Namespace: open-webui
Resource Version: 1785735959118047010
UID: 08199b78-c069-4b24-98c1-3c421656f9b5
Reporting Controller: replicaset-controller
Type: Warning
Events:

```

Commencez par la réconciliation de la configuration AuthProxyWorkload du webhook d’admission et par le PortConflict signalé pour le port du proxy 5432. Reproduisez le cas avec deux ressources AuthProxyWorkload utilisant le même selector et la même chaîne de connexion, puis déterminez le traitement attendu pour les configurations identiques par rapport aux configurations conflictuelles et ajoutez une couverture de régression pour le comportement convenu.

Rédigé par le modèle d'indexation à partir du texte de l'issue.