Link to Harbormaster build targets from the Daemon worker page

Summary:
Fixes T7370. Two changes:

• Make the default to show nothing, instead of showing all the data. This is a better default because the data is sometimes sensitive. Workers should have to opt in to revealing it.
• For TargetWorkers, link to the target (technically the build, for now, since there's no dedicated target detail page).

Test Plan:

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T7370

Differential Revision: https://secure.phabricator.com/D13845