Fix regressions with exploration and table shares

[seancolsen]

Fixes #3452
Fixes #3455

Notes

• This seems to fix the bug, I'm not 100% certain this is the best way to fix it. Please review carefully, @pavish. You know this code much better than me.
• I also opened Column types not showing within shared tables and explorations #3455 for (what seems like) an unrelated bug with shares.

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[seancolsen]

Update: Hmmm, it seems like #3455 maybe is related. It seems like maybe we need to have the currentDatabase store set within these "share" pages in order to have the derived currentDbAbstractTypes store become defined. 🤔 I need to sign off for today, but I'll leave this thought here in case you want to pick up on this digging.

[seancolsen]

Ok, I got some more time to dig deeper, and I'm feeling a little more confident in this fix. I pushed some more commits to address #3455 too.

[pavish]

@seancolsen This seems to be a regression on the backend. We are no longer receiving anything within the connections key in the common_data which is essential, instead it's received in the databases key.

I'm going to close the PR since it's not fixing the underlying issue. The idea was for the components to always expect the database prop to be defined.

I'd like the following changes, but we can get that done in a different PR:

• I think we should be throwing an error on the frontend if there's nothing on the connections list but there's a current_connection set.
• I'd also want the the type duplication fix you made in this PR.