Check if pose pipeline can see tags and error if not

[spacey-sooty]

This can allow us to skip pose filtering if there's no tags in view (pose has to be wrong in this case).

[spacey-sooty]

Limelight makes this quite difficult from what I can tell, but its a simple change with PhotonVision

[spacey-sooty]

the limelight api is terribly documented, its the 7th entry in the botpose https://github.com/LimelightVision/limelightlib-wpijava/blob/main/LimelightHelpers.java#L511