[gpu-op] NVIDIADriver ignores spec.gds.imagePullPolicy #3200

NVIDIADriver accepts spec.gds.imagePullPolicy, but the rendered GDS container (nvidia-fs-ctr) always uses IfNotPresent.

Steps to reproduce

1. Configure a NVIDIADriver with GDS enabled and a non-default image pull policy:

   spec:
     gds:
       enabled: true
       repository: nvcr.io/nvidia/cloud-native
       image: nvidia-fs
       version: "2.29.4"
       imagePullPolicy: Always

2. Inspect the generated driver DaemonSet's nvidia-fs-ctr container.

Expected behavior

The container uses the configured policy:

imagePullPolicy: Always

Actual behavior

The container uses:

imagePullPolicy: IfNotPresent

The NVIDIADriver DaemonSet template hardcodes this value.

This also affects imagePullPolicy: Never. The requested policy is silently ignored, potentially changing registry access and cached-image behavior when containers start.

Verification

Verified through manifest rendering against main at 6532a331b5907ecd6a99c3714ef2b922427a6888:

Controls confirmed that:

• The equivalent GDS configuration through ClusterPolicy preserves Always and Never.
• NVIDIADriver's GDRCopy container preserves its configured image pull policy.

Suggested fix

Render spec.gds.imagePullPolicy for the GDS container, retaining IfNotPresent when the setting is omitted.

Add regression coverage for omitted, IfNotPresent, Always, and Never values.