R1:de379c8b61b8

Allow workboard sorting and filtering to be saved as defaults

Summary:
Fixes T6641. This allows users who have permission to edit a project to use "Save as Default" to save the current order and filter as defaults for the project.

These are per-board defaults, and apply to all users. The rationale is that I think the best default ordering/filtering depends mostly on the board, not the viewer.

This seems to align with most requests in the task, although rationale is a bit light. But, for example, it…