Run FileTreeDiff indexer on all versions in dev

[ericholscher]

This allows easier support for working on this locally,
and runs it against all active verisons.

[humitos]

I would prefer if we don't have different behavior for these on development than in production. It gets hard to debug when something doesn't work as expected.

It's useful to have to file the full workflow in development as well, so we know how it works on production as well.

[ericholscher]

@humitos it seems really hard to setup GH webhooks and full integration locally, including having a "local" instance pushing live build status to PRs, so I think it makes sense here?

[humitos]

That's a good point. I forgot how I was testing this, but definitely not setting up GH webhooks nor pushing live build status to PRs. I think I marked a Version.is_external=True from the Django admin 🤔

[ericholscher]

Yea, just seems nice to have a good way to turn this on locally. You still need to enable it in the Addons Config, but I think having a good test of it is useful, and makes dev easier. But I can also just do a quick note in the docs/code about a workflow for enabling dev if we think that's better than baking it into the code.