### 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.
s3_resource.Object(s3_bucket, "/foo").put(Body="foobar")
        s3_resource.Object(s3_bucket, "bar").put(Body="barfoo")
        s3_resource.Object(s3_bucket, "/bar/foo/").put(Body="test")
        with 
            s3_resource.Object(s3_bucket, "foo").get()
        e.match("NoSuchKey")
        with 
            s3_resource.Object(s3_bucket, "/bar").get()
        e.match("NoSuchKey")
        response = s3_resource.Object(s3_bucket, "/foo").get()
        assert response["Body"].read() == b"foobar"
        response = s3_resource.Object(s3_bucket, "bar").get()
        assert response["Body"].read() == b"barfoo"
        response = s3_resource.Object(s3_bucket, "/bar/foo/").get()
        assert response["Body"].read() == b"test"
    @pytest.mark.aws_validated
    def test_metadata_header_character_decoding(self, s3_bucket, snapshot, aws_client):