Enable deletion protection on BackupTable

[Olesp]

Description of changes: This enable the deletion protection on the backup table. This prevent from any accidental deletion. This is considered as a fail when using the cfn-lint command.

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[mikeols]

Thank you @Olesp! We will review this change. We cannot merge these PRs directly, but will incorporate it into our next release. This change may have unintended consequences for some users, such as leaving tables around that you aren't expecting to remain after a stack deletion. We may implement this using a parameter that defaults to false, but allows the user to change it upon deploy.