Do not keep web container running during termination

We could let the web container terminate as usual, as there are no
reasons to keep it running as it doesn't participate in
job control. Additionally, it stops receiving traffic with the beginning
of termination

> At the same time as the kubelet is starting graceful shutdown, the
> control plane removes that shutting-down Pod from EndpointSlice (and
> Endpoints) objects where these represent a Service with a configured
> selector

@ https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#pod-termination

roles/installer/templates/deployments/deployment.yaml.j2

@@ -244,18 +244,6 @@ spec:
 {% endif %}
 {% if web_extra_volume_mounts -%}
             {{ web_extra_volume_mounts | indent(width=12, first=True) }}
-{% endif %}
-{% if termination_grace_period_seconds is defined %}
-            - name: pre-stop-data
-              mountPath: /var/lib/pre-stop
-            - name: pre-stop-scripts
-              mountPath: /var/lib/pre-stop/scripts
-          lifecycle:
-            preStop:
-              exec:
-                command:
-                - bash
-                - /var/lib/pre-stop/scripts/termination-waiter
 {% endif %}
           env:
             - name: MY_POD_NAMESPACE