Recreates the wp3/wp4 position-2 collision via `update_column` so the
service's `created_at` tiebreaker is exercised, and drops the
unneeded `, id` tiebreaker from the SQL. Also resets sprint2's
earlier siblings because the new `[:project_id, :sprint_id]`
`acts_as_list` scope shifts them during creation, where the previous
version + Story-types scope was inert for the generic test type.
Addresses review feedback on PR #22740.
Alexander Brandon Coles
3f60c4d1b4