First step of interactive serialization test fix

[#62048198]

Now it just works fine, without throwing errors (it was happening in
my local env), however still the actual test is missing. It was
removed accidentally here:

https://github.com/concord-consortium/lab/commit/2dc4dff00bc3da3b3fed8f48650bddfc4809af30#diff-18ef887a273a1345b17b8c49935afdc6