### 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.
aws_client.s3.put_(Bucket=s3_bucket, Key="mykey", Body=body)
        response = aws_client.s3.get_(Bucket=s3_bucket, Key="mykey")
        snapshot.match("get-", response)
        response = aws_client.s3.copy_(
            Bucket=s3_bucket,
            CopySource=f"{s3_bucket}/mykey",
            Key="copiedkey",
            BucketKeyEnabled=True,
            SSEKMSKeyId=key_id,
            ServerSideEncryption="aws:kms",
        )
        snapshot.match("copy-", response)
        response = aws_client.s3.get_(Bucket=s3_bucket, Key="copiedkey")
        snapshot.match("get-copied-", response)
    @pytest.mark.aws_validated
    def test_region_header_exists(self, s3_create_bucket, snapshot, aws_client):
        snapshot.add_transformer(snapshot.transform.s3_api())
        bucket_name = s3_create_bucket(
            CreateBucketConfiguration={"LocationConstraint": "eu-west-1"},
        )
        response = aws_client.s3.head_bucket(Bucket=bucket_name)
        assert response["ResponseMetadata"]["HTTPHeaders"]["x-amz-bucket-region"] == "eu-west-1"
        snapshot.match("head_bucket", response)
        response = aws_client.s3.list_s_v2(Bucket=bucket_name)
        assert response["ResponseMetadata"]["HTTPHeaders"]["x-amz-bucket-region"] == "eu-west-1"
        snapshot.match("list_s_v2", response)
    @pytest.mark.aws_validated
    
    @pytest.mark.skip_snapshot_verify(paths=["$..Prefix", "$..list-buckets.Buckets"])
    def test_delete_bucket_with_content(self, s3_resource, s3_bucket, snapshot, aws_client):