libdpkg: Register all pending triggers for deferred processing

Trigger processing on the deferred stage is just opportunistic, but
we enqueue all currently pending triggers that might have been
activated on a previous unpack run, only when being called as
«dpkg --configure pkgname…».

This is a mostly conformant workaround for frontends like apt that do
not correctly call «dpkg --configure -a» or «dpkg --triggers-only -a»
after their normal runs, and leave packages in triggers-pending and
triggers-awaited states.

Closes: #766758

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