feat: reconnect to a different server may not be an error

[maartenbreddels]

cc @nmearl

In Cosmic data stories https://www.cosmicds.cfa.harvard.edu/ a reconnect will restore the state the user was on from a database. This means that if a machine goes down (due to scalign down), and a browser reconnects, it may not be an error.

Solara cannot know this, so we should have an option to configure this. Naming this might be hard (maybe * SOLARA_RECONNNECT_IS_ERROR=False)