t4205: correctly test %(describe:abbrev=...)

The pretty format %(describe:abbrev=<number>) tells describe to use
at least <number> digits of the oid to generate the human-readable
format of the commit-ish.

There are three things to test here:
  - Check that we can describe a commit that is not tagged (that is,
    for example our HEAD is at least one commit ahead of some reachable
    commit which is tagged) with at least <number> digits of the oid
    being used for describing it.

  - Check that when using such a commit-ish, we always use at least
    <number> digits of the oid to describe it.

  - Check that we can describe a tag. This just gives the name of the
    tag irrespective of abbrev (abbrev doesn't make sense here).

Do this, instead of the current test which only tests the last case.

Helped-by: Junio C Hamano <gitster@pobox.com>
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Hariom Verma <hariom18599@gmail.com>
Signed-off-by: Kousik Sanagavarapu <five231003@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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