Issue 979 Removing Fluent bit section and adding cloudwatch add on

[kathanjit]

What this PR does / why we need it:

Which issue(s) this PR fixes:

https://github.com/aws-samples/eks-workshop-v2/issues/979

Fixes #

• Removed Fluent bit section
• Added section on how to add CloudWatch Observability EKS add-on

Quality checks

• [x] My content adheres to the style guidelines
• [x] I ran make test module="<module>" it was successful (see https://github.com/aws-samples/eks-workshop-v2/blob/main/docs/automated_tests.md)

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

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