Modernize ReleephProjectQuery ordering/paging

Summary: Ref T7803. Continue removing implementations of getPagingColumn() and getReversePaging().

Test Plan: Browsed and paged through Releeph projects, Maniphest tasks, Diffusion repositories.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7803

Differential Revision: https://secure.phabricator.com/D12358