DDP wandb utils not running check_file() on --data

[glenn-jocher]

🐛 Bug

@AyushExel I found a bit of a bug today on starting a DDP training with --data coco.yaml. All our main python files (train, test, detect) are set up so that files passed to the argparser are searched locally inside the yolov5 repo using file = check_file(file). This allows for more concise commands like --cfg yolov5s.yaml rather than --cfg models/yolov5s.yaml, but it looks like opt.data got passed to the wandb utils before it had a chance to pass through check_file() first. Should be an easy fix, I think I can do this tomorrow.

To Reproduce (REQUIRED)

Start DDP training with --data coco.yaml

 python -m torch.distributed.launch --nproc_per_node 2 --master_port 1 train.py --batch 64 --cfg yolov5x.yaml --weights '' --data coco.yaml

[github-actions]

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[AyushExel]

@glenn-jocher I'm trying to fix it now

[AyushExel]

#3035 should fix this