Clean up IAM policy. Moved policy actions accordingly to its corresponded resources

[odoszhanov]

This PR fixes the issues where policy actions are not related to the policy resources, for e.g.

...
 {
            "Sid": "VisualEditor1",
            "Effect": "Allow",
            "Action": [
                "kafka-cluster:DeleteGroup",
                ...
            ],
            "Resource": "arn:aws:kafka:eu-central-1:297478128798:topic/test-wizard/7b39802a-21ac-48fe-b6e8-a7baf2ae2533-s2/*"
        },
...

Policy action kafka-cluster:DeleteGroup requires group resource and it has no impact on topic resource.
This change will make example configuration clean and accurate.

More details on policy actions and corresponding groups can be found in this AWS MSK IAM doc.

P.S. thanks for Kafka-UI ❤️