Currently stock moves are auto-assigned (i.e. reserve free stock) both
when the scheduler is run and when a corresponding stock move that can
assign a move is completed. This strictness was causing issues for
prioritization of moves to assign, for example a picking with a
scheduled_date far in the future could automatically reserve all stock
if it was created before another picking that an immediate
scheduled_date. To ease this, an extra setting has been added to
stock.picking.type to let users choose how reservations should occur for
moves assigned to that picking_type (or picking with that picking_type)
when the move is already confirmed:

1. 'at_confirm' = automatically when new stock becomes available or
   when the scheduler is triggered.
2. 'manual' = user must always manually click "Check Availability"
   button (scheduler will no longer reserve).
3. 'by_date' = automatically when new stock becomes available or when
   the scheduler is run within the move's reservation_date.

'by_date' has an extra option of # days before the move's scheduled
date that affects the move.reservation_date.

Additionally, because this new feature overlaps with the `procurement_jit` module's functionality, we remove the module and ensure its logic is reproduced directly in `sale_stock`.

Task: 2359317
Upgrade PR: odoo/upgrade#1868
ENT PR: odoo/enterprise#15050




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