Power girl costume implimication

BUR #58173 has been approved by @nonamethanks.

create implication power_girl_(2023_costume) -> power_girl
create implication power_girl_(1976_costume) -> power_girl

These costumes are official for this character

See topic #32808 and topic #35617.

Doing these for now since they're harmless and don't impact the greater discourse.

The bulk update request #58173 (forum #434782) has been approved by @nonamethanks.