### 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.
with 
            aws_client.s3.copy_(
                Bucket=bucket_name,
                Key="copy-test-sse-validate-kms-key-no-check",
                CopySource={"Bucket": bucket_name, "Key": src_key},
                ServerSideEncryption="aws:kms",
                SSEKMSKeyId="fake-key-id",
            )
        snapshot.match("copy-obj-wrong-kms-key", e.value.response)
    @pytest.mark.aws_validated
    @pytest.mark.skip_snapshot_verify(
        paths=[
            "$..ETag",  # the 
        ]
    )
    @pytest.mark.xfail(
        condition=LEGACY_S3_PROVIDER, reason="Validation no"
    )
    def test_s3_sse_validate_kms_key_state(
        self, s3_bucket, kms_create_key, monkeypatch, snapshot, aws_client
    ):
        snapshot.add_transformer(snapshot.transform.key_value("Description"))
        data = b"test-sse"
        # crea
        kms_key = kms_create_key()
        # snap
        snapshot.match("create-kms-key", kms_key)
        key_name = "put--with-sse"
        put__with_sse = aws_client.s3.put_(
            Bucket=s3_bucket,