Replace ad-hoc hline/show-head-commit with %show-commits

Every gexp that logged a repository HEAD commit defined its own local
hline and show-head-commit helpers.  Now that %show-commits exists as
a top-level program-file, replace all five remaining occurrences.

For the CD shepherd service gexps (genenetwork2-cd-gexp,
genenetwork3-cd-gexp, gn-auth-cd-gexp, gn-guile-gexp) the call moves
to just before the with-directory-excursion block that starts the
server.  No sudo is needed — the shepherd services already run as the
genenetwork user.

For genenetwork2-tests (the mechanical-rob Laminar job), all three git
clones are kept together and followed by a single %show-commits call
that logs all three repos at once.  Absolute paths are constructed at
runtime with (string-append (getcwd) "/repo-name") since the Laminar
user owns the fresh clones.

In all cases the local hline and show-head-commit definitions are
removed entirely.

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