Don't require VolumeSnapshots to run manager process

[DavidNix]

VolumeSnapshots are in GKE, but who knows if they are in other clusters.

 manager 2023-07-18T20:30:16Z    info    setup    Serving pprof endpoints at localhost:6060/debug/pprof                                                                           │
│ manager 2023-07-18T20:30:17Z    info    controller-runtime.metrics    Metrics server is starting to listen    {"addr": "127.0.0.1:8080"}                                         │
│ kube-rbac-proxy I0718 20:30:16.293117       1 main.go:186] Valid token audiences:                                                                                                │
│ kube-rbac-proxy I0718 20:30:16.293204       1 main.go:306] Generating self signed cert as no cert is provided                                                                    │
│ kube-rbac-proxy I0718 20:30:17.511985       1 main.go:356] Starting TCP socket on 0.0.0.0:8443                                                                                   │
│ kube-rbac-proxy I0718 20:30:17.512365       1 main.go:363] Listening securely on 0.0.0.0:8443                                                                                    │
│ manager I0718 20:30:18.155777       1 request.go:682] Waited for 1.048349996s due to client-side throttling, not priority and fairness, request: GET:https://10.8.139.157:443/ap │
│ manager Error: unable to create StatefulJob controller: VolumeSnapshot index: no matches for kind "VolumeSnapshot" in version "snapshot.storage.k8s.io/v1"