chore: Deprecate AppMesh charts following announcement for end of support of the AWS AppMesh service

[bryantbiggs]

Issue

• https://aws.amazon.com/blogs/containers/migrating-from-aws-app-mesh-to-amazon-ecs-service-connect/

Description of changes

• Deprecate AppMesh charts following announcement for end of support of the AWS AppMesh service. The appmesh-controller chart will continue to exist until removed at a later date

README has a warning of the deprecation

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

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