Update aws-vpc-cni and cni-metrics-helper charts for v1.15.0 release

[jdn5126]

Issue

N/A

Description of changes

This PR updates the aws-vpc-cni and cni-metrics-helper charts for the upcoming v1.15.0 release. Changes to call out in charts:
aws-vpc-cni:

• Removal of the update permission for nodes resources in ClusterRole
• Addition of get, watch, patch permissions for CNINodes resources in ClusterRole
• image tag updates

cni-metrics-helper:

• image tag updates

Checklist

• Added/modified documentation as required (such as the README.md for modified charts)
• Incremented the chart version in Chart.yaml for the modified chart(s)
• Manually tested. Describe what testing was done in the testing section below
• Make sure the title of the PR is a good description that can go into the release notes

Testing

Manually verified that chart can be applied

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

[jaydeokar]

lgtm