maint/CICD ~ speedup CICD by decreasing redundant AppVeyor CI workload
maint/CICD ~ speedup CICD by decreasing redundant AppVeyor CI workload

- 13 minutes to CI success/failure response from AppVeyor (approx median time); down from 45 minutes

.# [why]

Most of the testing done on AppVeyor is redundant with that done in the GHA:CICD.
With prior settings, AppVeyor was taking about 40 minutes to an hour (median ~ 45
minutes) to report success/failure. In contrast, the GHA:CICD workflow usually completes
in about 13 minutes (median).

AppVeyor job times are approximately 5 to 8 minutes per build and are done sequentially
with no report until all build jobs are complete (whether "allow failure" or not).

uutils/coreutils,uutils/coreutils,uutils/coreutils