Add selector to exclude namespace admission controller is deployed in

[paulbraham-ds]

Issue

https://github.com/aws/eks-charts/issues/1088

Description of changes

This PR adds a namespaceSelector so the mutating webhook does not run on the namespace the webhook controller is installed in.

Checklist

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

Testing

Changes submitted in this PR tested locally against Helm v3 on an EKS 1.27 cluster. After these additions I can delete all pods in the deployment and new pods come back without issue.

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

[paulbraham-ds]

Anybody able to review this?