Add SafePtr to contextual logging allow list functions

[kaisoz]

This PR adds klog.SafePtr to the list of the functions allowed after the migration to contextual logging. We use this function to prevent panics when logging nil pointers.

Reference: kubernetes/kubernetes#121554

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[kaisoz]

/assign @pohly

[pohly]

/lgtm
/approve

Thanks!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaisoz, pohly

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