ci: use test-tool as unit test runner on Windows

Although the previous commit changed t/Makefile to run unit tests
alongside shell tests, the Windows CI still needs a separate unit-tests
step due to how the test sharding works.

We want to avoid using `prove` as a test running on Windows due to
performance issues [1], so use the new test-tool runner instead.

[1] https://lore.kernel.org/git/[email protected]/

Signed-off-by: Josh Steadmon <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: steadmon

ci/run-test-slice.sh

@@ -17,7 +17,7 @@ handle_failed_tests
 
 # We only have one unit test at the moment, so run it in the first slice
 if [ "$1" == "0" ] ; then
-	group "Run unit tests" make --quiet -C t unit-tests-prove
+	group "Run unit tests" make --quiet -C t unit-tests-test-tool
 fi
 
 check_unignored_build_artifacts