I think it is trying to put the emphasis on the fact that it was a real team effort... Possibly akin to saying "I worked 120%", to emphasise how hard you worked, when clearly, you cannot work more than 100%!
According to what I have learned,
every refers to the entirety of the workers, whereas each refers to each single worker.
So "each worked hard" gives stronger emphasis to every(?) single worker of the team without exception.
To me, "Each and every one worked hard" means that every single worker worked hard, as well as the team in its entirety.
[blue]The last voice we will hear before the world explodes will be that of an expert saying:
"This is technically impossible!" - Sir Peter Ustinov[/blue]
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