Scope: write:boards

Does what Loop's board panel does: sets the property's board, records a board job with the
current board contractor, and writes Loop's "Board Type updated" note. No email is sent to
the contractor.

boardType and action are required. Changing to notRequired when the property has any
other board, or none set yet, is always recorded as needsTakingDown, as in Loop.
markAsDone records the job as done now.
userId must be an agent in the property's team; it defaults to the team's first agent.