NVIDIA / gpu-operator / 25339404316

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Fix nil pointer panic in upgrade controller when DrainSpec is not set

When UpgradePolicy.AutoUpgrade is true but no drain section is specified
in the ClusterPolicy, the upgrade controller panics at
upgrade_controller.go:172 due to a nil DrainSpec dereference.

Add a nil check for DrainSpec and initialize it with defaults when not
set, consistent with how UpgradePolicy itself is handled on line 160.

Fixes: https://github.com/NVIDIA/gpu-operator/issues/2417

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Harshal Patil <12152047+harche@users.noreply.github.com>

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