Share the Paste line highlighting behavior for Harbormaster build logs

Summary: Depends on D19164. Ref T13088. Now that the JS behaviors are generic, use them on the Harbormaster standalone page.

Test Plan: Clicked lines and dragged across line ranges. Reloaded pages. Saw expected highlighting behavior in the client and on the server across reloads.

Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam

Maniphest Tasks: T13088

Differential Revision: https://secure.phabricator.com/D19165