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

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[kwohlfahrt]

I'm happy to submit a PR adding this.

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