endpoint: Avoid policy sync error in log when endpoint disconnects
endpoint: Avoid policy sync error in log when endpoint disconnects

The following error was found regularly in logs. The event this happens is not
an error. It is a regular incident that the controller keeps running while the
endpoint is marked to be disconnected. The endpoint is first stopped and
removed before the controllers are removed. The log message can be safely
removed.

```
msg="before syncing policy maps in controller" containerID=4fb21d6b1d datapathPolicyRevision=0 endpointID=1133 error="lock failed: endpoint is in the process of being removed" ipv4=10.10.0.167 ipv6="f00d::a0a:0:0:46d" k8sPodName=default/spaceship-589d768cc4-ccc87 policyRevision=8
```

Signed-off-by: Thomas Graf <5f50a84c1fa3bcff146405017f36aec1a10a9e38@cilium.io>

tklauser/cilium,cilium-team/cilium,cilium/cilium,scanf/cilium,scanf/cilium,tklauser/cilium,tgraf/cilium,cilium/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,cilium-team/cilium,michi-covalent/cilium,michi-covalent/cilium,tgraf/cilium,scanf/cilium,scanf/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,scanf/cilium,tgraf/cilium,cilium/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium,scanf/cilium,scanf/cilium,tklauser/cilium,michi-covalent/cilium