### 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, s3_bucket, s3_multipart_upload, snapshot, aws_client
    ):
        key_name = "test-put--storage-class"
        with 
            aws_client.s3.put_(
                Bucket=s3_bucket,
                Key=key_name,
                Body=b"body-test",
                StorageClass=StorageClass.OUTPOSTS,
            )
        snapshot.match("put--outposts", e.value.response)
        key_name = "test-multipart-storage-class"
        with 
            aws_client.s3.create_multipart_upload(
                Bucket=s3_bucket,
                Key=key_name,
                StorageClass=StorageClass.OUTPOSTS,
            )
        snapshot.match("create-multipart-outposts-exc", e.value.response)
    @pytest.mark.aws_validated
    def test_response_structure(self, aws_http_client_factory, s3_bucket, aws_client):
        """
        Test that the response structure is correct for the S3 API
        """
        aws_client.s3.put_(Bucket=s3_bucket, Key="test", Body="test")
        headers = {"x-amz-content-sha256": "UNSIGNED-PAYLOAD"}
        s3_http_client = aws_http_client_factory("s3", signer_factory=SigV4Auth)
        def get_xml_content(http_response_content: bytes) -> bytes: