Imply stain for stained_clothes

BUR #56807 has been rejected.

create implication stained_clothes -> stain

stained clothes is stained

BUR #57106 has been approved by @nonamethanks.

deprecate stain

Counterproposal. We don't need an umbrella tag for stained clothes and stained bedsheets and post #9807185.

I'm also not sure what's the point of stained clothes when blood on clothes is 30 times as large. That might need to be deprecated for dirty clothes/cum on clothes/blood on clothes etc too.

The bulk update request #57106 (forum #426526) has been approved by @nonamethanks.

The bulk update request #56807 (forum #425595) has been rejected by @nonamethanks.