t1400: avoid touching refs on filesystem

The testcase t1400 exercises the git-update-ref(1) utility. To do so,
many tests directly read and write references via the filesystem,
assuming that we always use loose and/or packed references. While this
is true now, it'll change with the introduction of the reftable backend.

Convert those tests to use git-update-ref(1) and git-show-ref(1) where
possible. Furthermore, two tests are converted to not delete HEAD
anymore, as this results in a broken repository. They've instead been
updated to create a non-mandatory symbolic reference and delete that
one instead.

Some tests remain which exercise behaviour with broken references, which
cannot currently be converted to use regular git tooling.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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