[AWS::ECR::Repository] implement `drift detection`

### Name of the resource

AWS::ECR::Repository

### Resource Name

_No response_

### Issue Description

[AWS::ECR::Repository](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ecr-repository.html) does not support drift detection

[Resources supported for drift detection](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/resource-import-supported-resources.html).

### Expected Behavior

[AWS::ECR::Repository](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ecr-repository.html) included in drift detection results.

### Observed Behavior

[AWS::ECR::Repository](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ecr-repository.html) is NOT included in drift detection results.

### Test Cases

```aws cloudformation detect-stack-drift --stack-name EcrStack```
```aws cloudformation describe-stack-resource-drifts --stack-name EcrStack```

```StackResourceDrifts: []```

### Other Details

_No response_

The issue names no repository files or tests; start by reviewing the AWS::ECR::Repository CloudFormation documentation and the AWS CLI detect-stack-drift and describe-stack-resource-drifts commands. Done means an ECR repository is included in the stack resource drift results instead of returning an empty StackResourceDrifts list.

Written by the indexing model from the issue text.