### 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.
code: str = "BucketAlreadyExists"
    sender_fault: bool = False
    status_code: int = 400
class BucketAlreadyOwnedByYou(ServiceException):
    code: str = "BucketAlreadyOwnedByYou"
    sender_fault: bool = False
    status_code: int = 400
    BucketName: Optional[BucketName]
class InvalidObjectState(ServiceException):
    code: str = "InvalidObjectState"
    sender_fault: bool = False
    status_code: int = 400
    StorageClass: Optional[StorageClass]
    AccessTier: Optional[IntelligentTieringAccessTier]
class NoSuchBucket(ServiceException):
    code: str = "NoSuchBucket"
    sender_fault: bool = False
    status_code: int = 404
    BucketName: Optional[BucketName]
class NoSuchKey(ServiceException):
    code: str = "NoSuchKey"
    sender_fault: bool = False
    status_code: int = 404
    Key: Optional[ObjectKey]
class NoSuchUpload(ServiceException):
    code: str = "NoSuchUpload"
    sender_fault: bool = False
    status_code: int = 400
    UploadId: Optional[MultipartUploadId]
class ObjectAlreadyInActiveTierError(ServiceException):