[BUG] question mark in GIT_SKIP_TESTS is broken in master

[Andrei Rybak <rybak.a.v@xxxxxxxxx>]

Hi,

I've taken an example of how to use GIT_SKIP_TESTS directly from
t/README:

    $ GIT_SKIP_TESTS='t[0-4]??? t91?? t9200.8' make

and noticed that t0000 is still being run.  I've written a script to
bisect the issue:


    #/bin/sh

    (
            cd t
            GIT_SKIP_TESTS='t[0-4]??? t91?? t9200.8' make | \
                    head | grep 'SKIP skip all tests in t0000'
    )


and it bisected to edc23840b0 (test-lib: bring $remove_trash out of
retirement, 2021-05-10) which was merged to master in 2019256717 ("Merge
branch 'ab/test-lib-updates'", 2021-06-14).

Note, that spelling out the tests number in full works, i.e.

    $ GIT_SKIP_TESTS=t0000 make

won't run t0000.