split "core" and "connectors" build in CI

[cgardens]

Tell us about the problem you're trying to solve

• brace yourself the naming here is a big ambiguous with previously existing naming conventions.
• we have a full build and a shortened build ("CORE_ONLY"). the latter still depends on connectors (for at least formatting).

Describe the solution you’d like

• my goal is to be able to push a change to the core platform and have only direct dependencies of the core platform are built. nothing to do with connectors. this is to decrease false negatives in build failures (which are relatively frequent).

heads up sherifnada

┆Issue is synchronized with this Asana task by Unito

[michel-tricot]

As long as we can always build everything from a simple gradle command, i am all for it!

[jrhizor]

How are you planning on handling normalization? I think that's the only "core" thing that's Python (and 99% of our false negatives are Python related).