myasnikovdaniil 2fa15ce044 fix: startupProbes for kubevirt-cdi-operator and grafana-operator (#2725)
## What this PR does

Adds `startupProbe` to two operator deployments whose readiness probes
fail repeatedly during a cold cluster install, generating noise and (for
CDI) blocking dependants on slow leader-election:

- **`kubevirt-cdi-operator`** — leader-election against a slow
`kube-apiserver` (Kamaji control plane bringup) consistently takes >30s
on a cold install. The default readinessProbe with 1s `periodSeconds` /
3 `failureThreshold` fires the first time election times out, the
operator pod gets marked NotReady, and dependants block on it.
- **`grafana-operator`** — bootstrap CRD discovery + Helm-managed
Dashboard reconcile loop spikes startup duration past readinessProbe's
default budget under load.

`startupProbe` gives each operator a longer one-time window to reach
steady state; the regular `readinessProbe` then takes over with its
tight per-second cadence to detect genuine ongoing failures.

## Origin

Both commits lifted unchanged from #2619.

### Release note

```release-note
NONE
```


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-->

## Summary by CodeRabbit

* **Configuration Updates**
  * Added startup health checks to Grafana operator container
  * Added startup health checks to KubeVirt CDI operator container

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