Add %show-commits and wire it into gn-integration-tests-gexp

Introduce %show-commits, a standalone program-file that accepts an
arbitrary list of paths as command-line arguments and prints the HEAD
commit of each one that is a git repository, silently skipping any
path that does not exist or has no .git directory.

This replaces the ad-hoc show-head-commit helpers that were defined
locally in gn-auth-test-flask and gn-integration-tests-gexp.  The
caller decides whether sudo is required:

  ;; Laminar user owns this clone — no sudo:
  (invoke #$%show-commits path)

  ;; CD-managed repos are owned by genenetwork — use sudo:
  (invoke #$sudo "-u" "genenetwork" #$%show-commits path1 path2 ...)

Changes:

* Remove hline, show-head-commit, and the five show-head-commit calls
  from gn-auth-test-flask.  They ran on every flask invocation (noisy)
  and will be replaced by a single %show-commits call at the job level.

* Define %show-commits after %gn-auth-test-flask.

* In gn-integration-tests-gexp:
  - Add repositories-checkout-directory to the match-record.
  - Remove the local hline and show-head-commit helpers.
  - Call %show-commits without sudo for the freshly-cloned
    gn-integration-tests repo (Laminar user owns it).
  - Call %show-commits via sudo -u genenetwork for the four
    CD-managed repos (gn-auth, gn-libs, genenetwork3, genenetwork2).

* Add %show-commits to the sudoers rule so the Laminar user may run
  it as the genenetwork user.

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