### 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.
self,
        context: RequestContext,
        request: ListMultipartUploadsRequest,
    ) -> ListMultipartUploadsOutput:
        
        
        
        bucket = request["Bucket"]
        moto_backend = get_moto_s3_backend(context)
        
        get_bucket_from_moto(moto_backend=moto_backend, bucket=bucket)
        multiparts = list(moto_backend.get_all_multiparts(bucket).values())
        if (prefix := request.get("Prefix")) is not None:
            multiparts = [upload for upload in multiparts if upload.key_name.startswith(prefix)]
        
        uploads = [
            MultipartUpload(
                Key=upload.key_name,
                UploadId=upload.id,
                Initiator={
                    "ID": f"arn:aws:iam::{context.account_id}:user/user1-11111a31-17b5-4fb7-9df5-b111111f13de",
                    "DisplayName": "user1-11111a31-17b5-4fb7-9df5-b111111f13de",
                },
                Owner={
                    "ID": "75aa57f09aa0c8caeab4f8c24e99d10f8e7faeebf76c078efc7c6caea54ba06a",
                    "DisplayName": "webfile",
                },
                StorageClass=StorageClass.STANDARD,  
                Initiated=datetime.datetime.now(),  
            )