### 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.
Body: Optional[IO[Body]]
    RequestRoute: RequestRoute
    RequestToken: RequestToken
    StatusCode: Optional[GetObjectResponseStatusCode]
    ErrorCode: Optional[ErrorCode]
    ErrorMessage: Optional[ErrorMessage]
    AcceptRanges: Optional[AcceptRanges]
    CacheControl: Optional[CacheControl]
    ContentDisposition: Optional[ContentDisposition]
    ContentEncoding: Optional[ContentEncoding]
    ContentLanguage: Optional[ContentLanguage]
    ContentLength: Optional[ContentLength]
    ContentRange: Optional[ContentRange]
    ContentType: Optional[ContentType]