Update Product Planning Controller Urgencies

Controller actions loading HTML pages without applying filters were given an urgency of medium (0.5s).

However, they breach this with almost identical frequency (10-20%). This indicates there is probably little information unique to the controller actions themselves or their use of the database or Redis. Breach could be related to network overhead.

It causes error budget spend which is not likely to be attributable to the Rails stack. This change reverts those urgencies to the default.