### 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.
Bucket: BucketName
    Delimiter: Optional[Delimiter]
    EncodingType: Optional[EncodingType]
    Marker: Optional[Marker]
    MaxKeys: Optional[MaxKeys]
    Prefix: Optional[Prefix]
    RequestPayer: Optional[RequestPayer]
    ExpectedBucketOwner: Optional[AccountId]
class ListObjectsV2Output(TypedDict, total=False):
    IsTruncated: Optional[IsTruncated]
    Name: Optional[BucketName]
    Prefix: Optional[Prefix]
    Delimiter: Optional[Delimiter]
    MaxKeys: Optional[MaxKeys]
    CommonPrefixes: Optional[CommonPrefixList]
    EncodingType: Optional[EncodingType]
    KeyCount: Optional[KeyCount]
    ContinuationToken: Optional[Token]
    NextContinuationToken: Optional[NextToken]
    StartAfter: Optional[StartAfter]
    BucketRegion: Optional[BucketRegion]
    Contents: Optional[ObjectList]
class ListObjectsV2Request(ServiceRequest):