R1:edcc3232aabc

Remove calls to getCallsign() in bin/repository scripts

Summary:
Ref T4245. Prepare these scripts for a callsign-free world. This also makes them more flexible and easier to use.

The following are now valid ways to identify a repository for these scripts: ID (`3`), PHID (`PHID-REPO-wxyz`), R<ID> (`R3`), r<CALLSIGN> (`rSKYNET`), CALLSIGN (`SKYNET`).

In the future, a human-readable label (`skynet`) may also become valid.

Test Plan:
- Ran `bin/repository reparse --all ...` with `rX`, `X`, `3`, `R3`.
- Ran…