Add `inRemediation` to user state metadata
Add `inRemediation` to user state metadata

This is for the dashboard to know if a student is currently in remediation.

This does not get loaded into the user state when the user starts the game,
so we consider it metadata, like currentChallenge, and do not need to
update the migrations.

[#157265928]
concord-consortium/geniblocks,concord-consortium/geniblocks,concord-consortium/geniblocks