Omit KubeletConfiguration and Limits from the Provisioner Spec if empty

[bwagner5]

1. Issue, if available:
N/A

2. Description of changes:

• KubeletConfiguration and Limits were being included into the provisioner spec even when they are empty. This is because both of these types are structs and not pointers or another pointer type. omitempty will not work with structs, so this PR changes the Spec to use pointers.

Example Before:

spec:
   kubeletConfiguration: {}
   limits: {}
   provider:
     apiVersion: extensions.karpenter.sh/v1alpha1
     instanceProfile: KarpenterNodeInstanceProfile-karpenter-demo
     kind: AWS
     securityGroupSelector:
       kubernetes.io/cluster/karpenter-demo: '*'
     subnetSelector:
       kubernetes.io/cluster/karpenter-demo: '*'

Example After:

spec:
   provider:
     apiVersion: extensions.karpenter.sh/v1alpha1
     instanceProfile: KarpenterNodeInstanceProfile-karpenter-demo
     kind: AWS
     securityGroupSelector:
       kubernetes.io/cluster/karpenter-demo: '*'
     subnetSelector:
       kubernetes.io/cluster/karpenter-demo: '*'

3. How was this change tested?

• Tested a manual scale-up with AL2 and Bottlerocket

4. Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: link to issue
• No

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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[ellistarn]

Amazing!