Don't require passing in disabled backup plans

[regularfry]

What is the problem this feature will solve?

Because the source project contained both S3 and DynamoDB resources, the module configuration assumes that it'll be passed valid backup plans for both. In a project where we don't need to enable all the resource types, the resulting config is needlessly verbose. For instance:

  backup_plan_config_dynamodb = {
                                  "compliance_resource_types": [
                                    "DynamoDB"
                                  ],
                                  "rules": [
                                  ],
                                  "enable": false,
                                  "selection_tag": "NHSE-Enable-Backup"
                                }

What is the feature that you are proposing to solve the problem?

Set the default backup plan for each resource type to a disabled config, so that a resource type will only be included if an enabled config is specified.

What alternatives have you considered?

No response

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