### 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.
# Sign
        # http
        _key = "key-header-overrides"
        aws_client.s3.put_(Bucket=s3_bucket, Key=_key, Body="something")
        expiry_date = "Wed, 21 Oct 2015 07:28:00 GMT"
        response = aws_client.s3.get_(
            Bucket=s3_bucket,
            Key=_key,
            ResponseCacheControl="max-age=74",
            ResponseContentDisposition='attachment; filename="foo.jpg"',
            ResponseContentEncoding="identity",
            ResponseContentLanguage="de-DE",
            ResponseContentType="image/jpeg",
            ResponseExpires=expiry_date,
        )
        snapshot.match("get-", response)
    @pytest.mark.only_localstack
    @pytest.mark.skipif(condition=LEGACY_S3_PROVIDER, reason="Testing new ASF handler behaviour")
    def test_virtual_host_proxying_headers(self, s3_bucket, aws_client):