sema: always run a decoded push's work when the push is reached

The pump gated collected fills/copies on the tracking semaphore being
translatable and behind the release payload. On real hardware the work
always executes and the release only orders observers, so the gate
dropped work exactly when it was needed to bootstrap translations
(UVM's CE memsets writing page tables into vidmem, whose tracking
semaphores live in the address space those writes create) and skipped
pushes as stale as soon as a tracking semaphore advanced past them.
Execute the work at the release method for every push read through a
trusted ring; swept-RAM decoding still never runs work. Count op runs
in the sweep stats (ringops).

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