Re: [PATCH 01/12] test-lib: remove check_var_migration

Ævar Arnfjörð Bjarmason  [off-list ref] writes:

Remove the check_var_migration() migration helper. This was added back
in [1], [2] and [3] to warn users to migrate from e.g. the
"GIT_FSMONITOR_TEST" name to "GIT_TEST_FSMONITOR".

I daresay that having been warning about this since late 2018 (or
v2.20.0) was sufficient time to give everyone interested a heads-up
about moving to the new names.

As this is not end-user facing backward-compatibility issue, I am
perfectly fine with the abbreviated schedule.

Queued.