Duplicate primary identifiers in cloudformation/resourcegroups-group

https://github.com/aws-cloudformation/iac-model-evaluation/blob/0fc13f985eeb35c667e4536c474511d643e02f31/cloudformation/resourcegroups-group.yaml#L11

https://github.com/aws-cloudformation/iac-model-evaluation/blob/0fc13f985eeb35c667e4536c474511d643e02f31/cloudformation/resourcegroups-group.yaml#L24

These parameters need to be unique across both resources.
```
E3019 Primary identifiers {'Name': {'Ref': 'AWS::StackName'}} should have unique values across the resources {'TagGroup', 'CloudFormationStackGroup'}
cloudformation/resourcegroups-group.yaml:11:7

E3019 Primary identifiers {'Name': {'Ref': 'AWS::StackName'}} should have unique values across the resources {'TagGroup', 'CloudFormationStackGroup'}
cloudformation/resourcegroups-group.yaml:24:7
```

error from CloudFormation
```
test1 already exists in stack arn:aws:cloudformation:X:X:stack/test1/X
```

Open cloudformation/resourcegroups-group.yaml at lines 11 and 24 and compare the primary identifiers for TagGroup and CloudFormationStackGroup. Reproduce the E3019 validation error, then make those identifiers unique and rerun the evaluation to confirm the duplicate-identifier error is gone.

Written by the indexing model from the issue text.