Who won a congressional medal of honor and an Olympic medal?

The proper answer would be ... no one. The fact is there is no award called the Congressional Medal of Honor. The proper name of the award is the Medal Of Honor.

The final reason why no one would have ever won both is because one does not 'win' a Medal of Honor. It is awarded, usually posthumously, for acts of military heroism above and beyond all other acts of bravery.