Register 32-bit ARM binfmt rules and keep QEMU changes package-local

qemu-binfmt-conf.sh groups arm with aarch64 and skipped it; Apple Silicon has
no AArch32 execution, so --ignore-family is needed for ARM32 programs. The
bin/sync-upstream extension, its tests and the Tests workflow edit are
reverted; QEMU updates become reviewed pins.

.github/workflows/test.yml

@@ -50,7 +50,6 @@ jobs:
               pacman -Syu --noconfirm git jq python libarchive
               python tests/oma-service-removal.py
               python tests/upstream-watch.py
-              python tests/qemu-upstream.py
               ./bin/sync-upstream self-test
               ./bin/sync-rebuilds --self-test
               ./bin/omarchy-pkgs self-test