Improve browsability of Almanac service datasource query

Summary: Ref T5750. Update the Almanac service query to be browsable.

Test Plan:

• Browsed and reordered Diffusion.
• Browsed and reordered services in Almanac.

{F373735}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5750

Differential Revision: https://secure.phabricator.com/D12433