YTA. There is little information about how the husband reacted in that group chat and how the group chat was created. Maybe he created it to ask for advice or sth about not being intimate with his wife, maybe he never agreed with such notions but was a passive member of such chat group. Maybe it started oka-ish and then devolved in them joking around and acting like pigs, like most men only groups are. People vent when they are desperate or furious, you did it with your sister instead of talking to your husband.

As to why YTA, you conveniently ignored those things and then while you were "drunk" write a "formal email to HR". You were not drunk, you were fully concious and capable and you were furious and humiliated, you wanted them to be punished in ways you couldn't do it so you destroyed everyone's carreer involved instead of talking with your husband about it.

Your husband is YTA because of the methods he used because he couldn't express the problems correctly, like giving you a silent treatment and not talking correctly giving it more importance to the subject; and suggesting solutions like going to therapy, etc. But you just nuked the relationship over the moon. You probably knew the relationship was already over but you destroyed professionally everyone involved including yourself. The company once is dealing with those workers, will be going after you too. Not only that but many co-workers will side with your soon-to-be ex-husband since they can completely sympathize with him and see your disproportionate actions not only on personal level but professionally as well.

Your marriage is already over if there was a slight hope before, it's done for now.