fix: Skip final RDS snapshot in SG for Pods

[niallthomson]

What this PR does / why we need it:

There seems to be cases where the RDS final snapshot gets created when cleaning up the SG for Pods lab due to missing IAM permissions. This does not seem to happen in the automated tests.

This PR explicitly disables the final snapshot instead of changing the IAM permissions.

Which issue(s) this PR fixes:

Fixes #1201

Quality checks

• My content adheres to the style guidelines
• I ran make test module="<module>" it was successful (see https://github.com/aws-samples/eks-workshop-v2/blob/main/docs/automated_tests.md)
• The PR has meaningful title and description of the changes that will be included in the workshop release notes

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