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

[sbueringer]

Follow-up to: https://github.com/kubernetes-sigs/cluster-api/pull/11074#discussion_r1732579892

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]

@sbueringer: This request has been marked as needing help from a contributor.

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In response to [this](https://github.com/kubernetes-sigs/cluster-api/issues/11108): >/help Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[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