k8s/watchers: Add missing v1 EndpointSlice group on init
k8s/watchers: Add missing v1 EndpointSlice group on init

The K8sWatcher's InitK8sSubsystem() calls resourceGroups() which returns
a list of resources that should be waited on via WaitForCacheSync(). The
v1 version of EndpointSlice was missing from this list. This commit adds
it.

Signed-off-by: Chris Tarazi <711c73f64afdce07b7e38039a96d2224209e9a6c@isovalent.com>

tklauser/cilium,michi-covalent/cilium,tklauser/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium,tklauser/cilium