### 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.
# List
        list_s_v2_url = f"{bucket_url}?list-type=2"
        resp = s3_http_client.get(list_s_v2_url, headers=headers)
        assert b'<?xml version="1.0" encoding="UTF-8"?>\n' in get_xml_content(resp.content)
        resp_dict = xmltodict.parse(resp.content)
        assert "ListBucketResult" in resp_dict
        # same 
        list_s_v2_tags = list(resp_dict["ListBucketResult"].keys())
        assert list_s_v2_tags.index("Name") < list_s_v2_tags.index("Contents")
        assert list_s_v2_tags[-1] == "Contents"
        # List
        list_multipart_uploads_url = f"{bucket_url}?uploads"
        resp = s3_http_client.get(list_multipart_uploads_url, headers=headers)
        assert b'<?xml version="1.0" encoding="UTF-8"?>\n' in get_xml_content(resp.content)
        resp_dict = xmltodict.parse(resp.content)
        assert "ListMultipartUploadsResult" in resp_dict
        # GetB
        location_constraint_url = f"{bucket_url}?location"
        resp = s3_http_client.get(location_constraint_url, headers=headers)
        assert b'<?xml version="1.0" encoding="UTF-8"?>\n' in get_xml_content(resp.content)
        tagging = {"TagSet": [{"Key": "tag1", "Value": "tag1"}]}
        # put 
        aws_client.s3.put_bucket_tagging(Bucket=s3_bucket, Tagging=tagging)
        # GetB
        get_bucket_tagging_url = f"{bucket_url}?tagging"
        resp = s3_http_client.get(get_bucket_tagging_url, headers=headers)
        resp_dict = xmltodict.parse(resp.content)
        assert resp_dict["Tagging"]["TagSet"] == {"Tag": {"Key": "tag1", "Value": "tag1"}}
        # put 
        key_name = "test-key"