feat: add instance-hypervisor as an AWS node label

[bwagner5]

Fixes #

Description

• Add instance-hypervisor label as an AWS node label so that you can filter for xen or nitro hypervisors.

How was this change tested?

• make test
• manually tested on an EKS cluster

Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: #
• No

Release Note

Add support for the AWS node label `karpenter.k8s.aws/instance-hypervisor` to select `nitro` or `xen` compatible instance types.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[tzneal]

Nice!