`MessageQueue`: unknit permanently overweight books (#13528)

* Unknit permanently overweight books

A book with only permanently overweight messages should be unkit
from the ready ring. This does currently not happen since perm.
overweight messages are not counted as "processed" and therefore
not increase the "total_processed" counter.

This is only a problem when the next and only message that is
processed is overweight. Eventually this should resolve itself
when another non-overweight message is enqueued and processed.
But for correctness it should be unknitted.

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Add tests

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* fmt

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* One more tests

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* ".git/.scripts/commands/bench/bench.sh" pallet dev pallet-message-queue

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: command-bot <>