This command teleports all survivors to the current checkpoint that you are at in your map.
The syntax for the warp_all_survivors_to_checkpoint command is as follows:
warp_all_survivors_to_checkpoint Default Value:
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warp_all_survivors_to_checkpoint
This is the only way you can use the warp_all_survivors_to_checkpoint - it will teleport all survivors to the most recent checkpoint that you unlocked.