### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

The Complete Multipart Upload operation generates the **InternalError** error for non-existing uploads.

### Expected Behavior

The Complete Multipart Upload operation generates the **NoSuchUpload** error for non-existing uploads.

### How are you starting LocalStack?

With a `docker run` command

### Steps To Reproduce

    docker run -it --rm -p 4566:4566 localstack/localstack

    aws s3api create-bucket --bucket test --endpoint-url http://localhost:4566 --create-bucket-configuration LocationConstraint=us-west-2

    aws s3api complete-multipart-upload --bucket test --endpoint-url http://localhost:4566 --key test --upload-id test

### Environment

```markdown
- OS: Windows 11
- LocalStack: latest
```


### Anything else?

The Abort Multipart Upload operation works correctly in LocalStack.

The official documentation: https://docs.aws.amazon.com/AmazonS3/latest/API/API_CompleteMultipartUpload.html
Amazon S3 throws the correct **NoSuchUpload** error for both Abort and Complete operations.
import moto.s3.models as moto_s3_models
    from moto.iam.access_control import PermissionResult
    from moto.s3.exceptions import InvalidObjectState
    if not os.environ.get("MOTO_S3_DEFAULT_KEY_BUFFER_SIZE"):
        os.environ["MOTO_S3_DEFAULT_KEY_BUFFER_SIZE"] = str(S3_MAX_FILE_SIZE_BYTES)
    
    moto_s3_models.STORAGE_CLASS.clear()
    moto_s3_models.STORAGE_CLASS.extend(s3_constants.VALID_STORAGE_CLASSES)
    @patch(moto_s3_responses.S3Response.key_response)
    def _fix_key_response(fn, self, *args, **kwargs):