Prevent object titles in the "Object Attacher" dialog from triggering Quicksand "Close Dialog on Navigation" behavior

Summary:
Fixes T13363. Currently, these are genuine links which we intercept events for.

Make them pseudolinks instead. Possible alternative approaches are:

• Keep them as genuine links, but mark them as non-navigation links for Quicksand. (But: yuck, weird special case.)
• Keep them as genuine links, and have the dialog handler JX.Stratcom.pass() to see if anything handles the event. (But: the "pass()" pattern generally feels bad.)

"Tableaus" or whatever comes out of T10469 some day will probably break everything anyway?

Test Plan:

• Opened the "Edit Related Tasks... > Edit Subtasks" dialog.
• Clicked task title links (not the "open in new window" icon, and not the "Select" button).
• Before: Dialog (sometimes) closed abruptly.
• After: Task is consistently selected as part of the attachment set.

Maniphest Tasks: T13363

Differential Revision: https://secure.phabricator.com/D20693