### 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.
IntelligentTieringDays = int
IntelligentTieringId = str
InventoryId = str
IsEnabled = bool
IsLatest = bool
IsPublic = bool
IsTruncated = bool
KMSContext = str
KeyCount = int
KeyMarker = str
KeyPrefixEquals = str
LambdaFunctionArn = str
Location = str
LocationPrefix = str
MFA = str
Marker = str
MaxAgeSeconds = int
MaxKeys = int
MaxParts = int
MaxUploads = int
Message = str
MetadataKey = str
MetadataValue = str
MetricsId = str
Minutes = int
MissingMeta = int
MultipartUploadId = str
NextKeyMarker = str
NextMarker = str
NextPartNumberMarker = int