Regarding Constantine, please see the past discussion thread here.
Regarding Joan of Arc, she wasn’t killed in hatred of the Catholic faith, but rather was killed as a purported heretic by the Catholic faithful. So technically, she’s not a martyr.
She was removed from the general calendar along with a lot of other European medieval saints to make room for new saints who came from more modern times and places other than Europe. However, her feast is still celebrated in France and in some other places, so I’m not sure what the point is of advocating since local bishops are free to celebrate her feast.
I would suggest you start a new thread in “Liturgy and Sacraments” about the intinction question, as that doesn’t really belong in Spirituality section, nor does it have anything to do with Constantine or Joan of Arc.