fix: fetch discussion and ressources info when accepting a group invitation

Also ensure that the actor is included in PERSON_STATUS_GROUP, to stay consistent with LOGGED_USER_MEMBERSHIPS as used in MyGroups.vue.

The accept-invitation and refuse-invitation events needed to be emitted before refetching PERSON_STATUS_GROUP, so they can be caught by GroupView.vue before <InvitationsList> is destroyed due to the v-if becoming false.

Fixes #1800

src/graphql/actor.ts

@@ -338,6 +338,9 @@ export const PERSON_STATUS_GROUP = gql`
         elements {
           id
           role
+          actor {
+            ...ActorFragment
+          }
           parent {
             ...ActorFragment
           }