Improve "Waiting for Node volumes to be detached" log message

[sbueringer]

Follow-up to: #11074 (comment)

This issue is about improving the "Waiting for Node volumes to be detached" log message added in #11074.

Open questions:
a) should we add details about the volumes that we are still waiting for?
b) which information about the volumes should be added to the logs (e.g. are the AttachedVolume.name fields useful to users?)
c) Should we add something to the condition?

Context:

// AttachedVolume describes a volume attached to a node
type AttachedVolume struct {
	// Name of the attached volume
	Name UniqueVolumeName `json:"name" protobuf:"bytes,1,rep,name=name"`

	// DevicePath represents the device path where the volume should be available
	DevicePath string `json:"devicePath" protobuf:"bytes,2,rep,name=devicePath"`
}

[sbueringer]

/cc @enxebre @fabriziopandini

[sbueringer]

/triage accepted
/area logging
/priority backlog

[sbueringer]

/help

[k8s-ci-robot]

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[sivchari]

I'd take this task.
/assign

[sbueringer]

Thx. I think we need some real life data to figure out what we can put in the logs