Use the DeclarativeHotplugVolumes featureflag

[SkalaNetworks]

Currently, the CSI-driver uses the "HotPlug" feature-flag in Kubevirt, but the newest way of handling hotplug is through DeclarativeHotplugVolumes

[awels]

Correct we are actively working on getting the featuregate to GA in KubeVirt, so we don't have to specify the feature gate anymore.

[kubevirt-bot]

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[kubevirt-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
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