ClientTrafficPolicy reports Accepted: True when target listener is not in a healthy state

**Description**:
`ClientTrafficPolicy` shows `Accepted: True` in `status.ancestors` even when its target is not in a healthy state. The CTP should reflect that its target is not ready rather than silently claiming a successful attachment with no data-plane effect.

**Repro steps**:
1. Create a CTP targeting a listener that is not in a healthy state (e.g. missing TLS certificate ref)
2. Observe that the CTP `status.ancestors` still shows `Accepted: True`

**Environment**:
main (also present in v1.8.x)

**Logs**:
N/A — reproducible via `kubectl get clienttrafficpolicy -o yaml`