assistant_context_editor: Don't block `ContextStore` initialization on reloading contexts (#24052)
Marshall Bowers
created
This PR changes the `ContextStore` constructor to not block on reloading
the contexts before we finish initializing it.
I noticed that the Assistant panel was taking a long time to show up in
the status bar, and upon further investigation uncovered that with a
large number of contexts (I have ~320) it takes a long time to load them
all.
Release Notes:
- N/A