Remove various additional calls to getCallsign()

Summary: Ref T4245. These are all straightforward to remove.

Test Plan:

• Edited paths in a package.
• Ran bin/audit delete --repositories ... with various identifiers.
• Searched by repository for R3, rAAAA in Harbormaster.
• Did a Herald dry run on a commit.
• Browsed commits, made comments.
• Viewed a Releeph product list.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T4245

Differential Revision: https://secure.phabricator.com/D14927