Allow custom labels in CCM Helm chart

[kwohlfahrt]

What would you like to be added:

Add custom labels to objects of the AWS CCM Helm chart.

Why is this needed:

We install the AWS CCM as a Helm chart. We also add labels to all infrastructure components (e.g. app.kubernetes.io/part-of: core-infrastructure), to make it easeir to distinguish them from user workloads and allocate cost appropariately.

Unfortunately, the AWS CCM Helm chart does not allow customizing object labels, like e.g. the cluster autoscaler does with additionalLabels, so we can't follow our usual pattern here.

/kind feature

[k8s-ci-robot]

This issue is currently awaiting triage.

If cloud-provider-aws contributors determine this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[kwohlfahrt]

I'm happy to submit a PR adding this.