Replace the Wine-emulated windows job and the independent windows-native
job with a single required native Windows job that runs
check:ci:windows-complete on the hosted larger runner, falling back to
the self-hosted [self-hosted, dsh-win-ci, windows] pool under failover
(DSH_CI_FAILOVER=selfhosted). The serial-windows standby mirrors
serial-linux-selfhosted: master-only, unsharded, self-hosted, absent
from all-checks-passed.
Remove wine-apt-cache, the check:windows-wine script reference, and the
dual-lane topology the two Windows notes described.