### 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.
resp = aws_client.s3.copy_(
            Bucket=s3_bucket,
            CopySource=f"{s3_bucket}/{_key}",
            Key=_key,
            ServerSideEncryption="aws:kms",  # th
        )
        snapshot.match("copy--in-place-with-sse", resp)
        head_ = aws_client.s3.head_(Bucket=s3_bucket, Key=_key)
        snapshot.match("head-copy-with-sse", head_)
        # th
        # as 
        resp = aws_client.s3.copy_(
            Bucket=s3_bucket,
            CopySource=f"{s3_bucket}/{_key}",
            Key=_key,
        )
        snapshot.match("copy--in-place-without-kms-sse", resp)
        head_ = aws_client.s3.head_(Bucket=s3_bucket, Key=_key)
        snapshot.match("head-copy-without-kms-sse", head_)
        resp = aws_client.s3.copy_(
            Bucket=s3_bucket,
            CopySource=f"{s3_bucket}/{_key}",
            Key=_key,
            ServerSideEncryption="AES256",
        )
        snapshot.match("copy--in-place-with-aes", resp)
        head_ = aws_client.s3.head_(Bucket=s3_bucket, Key=_key)
        snapshot.match("head-copy-with-aes", head_)
    @pytest.mark.aws_validated
    def test_copy_in_place_with_bucket_encryption(self, aws_client, s3_bucket, snapshot):