Diorama scaffold tests

[willemolding]

PR summary

Another little one. Changes the test skeleton produced by hc init to use diorama.js instead of holochain-nodejs.

Running

hc init test_dna
cd test_dna/zomes && hc generate my_zome && cd ..
hc test

results in tests running and passing using diorama.

changelog

Please check one of the following, relating to the CHANGELOG-UNRELEASED.md

• this is a code change that effects some consumer (e.g. zome developers) of holochain core so it is added to the CHANGELOG-UNRELEASED.md (linked above), with the format - summary of change [PR#1234](https://github.com/holochain/holochain-rust/pull/1234)
• this is not a code change, or doesn't effect anyone outside holochain core development

[Connoropolous]

Nice! follow up should be getting that CI test that actually tests the scaffold code merged too so that we don’t forget about this dependency on diorama and break things for the CLi constantly

[lucksus]

Great!
I've just published the next Diorama version. Let's include the new version in here already.

[maackle]

🙌 thanks!