Support the `DevicePluginCDIDevices` feature gate

[jfroy]

This patch adds support for the DevicePluginCDIDevices feature gate by adding spec.operator.useDevicePluginCDIDevicesFeature to ClusterPolicy. When this field is set, the operator sets the DEVICE_LIST_STRATEGY device plug-in environment variable to cdi-cri.

[jfroy]

@cdesiniotis @elezar

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[jfroy]

@cdesiniotis I imagine https://github.com/NVIDIA/gpu-operator/pull/1285 obsoletes this PR?

[jfroy]

@cdesiniotis I imagine #1285 obsoletes this PR?

Ah wait, no, it doesn't use "native CDI" but instead relies on annotations. I'll comment more in the internal document about this.

[cdesiniotis]

@jfroy I've updated #1285 to use the CRI instead of annotations, so yes, if we proceed with #1285 it will obsolete this PR. See the discussion here: https://github.com/NVIDIA/gpu-operator/pull/1285#discussion_r1963633036

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[jfroy]

This is no longer needed. 🚀