[addons/kubernetes-dashboard] remove fixed service account

[Hokwang]

What does this PR do?

• remove irsa (like metrics-server)
• user can set namespace for kubernetes-dashboard
• update chart version

Motivation

• user can not set namespace
• set_values is fixed (service account is "eks-admin" always), but helm chart can control this and in most cases, the user doesn't need to worry about service account setting.
• no needed service-accout.yaml file

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Yes, I have added a new example under examples to support my PR
• Yes, I have created another PR for add-ons under add-ons repo (if applicable)
• Yes, I have updated the docs for this feature
• Yes, I ran pre-commit run -a with this PR

Note: Not all the PRs required examples and docs except a new pattern or add-on added.

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[vara-bonthu]

Thanks for this PR @Hokwang. I am happy with this change but one small change required.