[MM-56174] Account for archived channels in channel member for post permission check (#25837)

* [MM-56174] Account for archived channels in channel member for post permission check

* Add tests

server/channels/store/sqlstore/channel_store.go

@@ -2107,7 +2107,7 @@ func (s SqlChannelStore) IsUserInChannelUseCache(userId string, channelId string
 	return false
 }
 
-func (s SqlChannelStore) GetMemberForPost(postId string, userId string) (*model.ChannelMember, error) {
+func (s SqlChannelStore) GetMemberForPost(postId string, userId string, includeArchivedChannels bool) (*model.ChannelMember, error) {
 	var dbMember channelMemberWithSchemeRoles
 	query := `
 		SELECT
@@ -2147,6 +2147,10 @@ func (s SqlChannelStore) GetMemberForPost(postId string, userId string) (*model.
 			ChannelMembers.UserId = ?
 		AND
 			Posts.Id = ?`
+
+	if !includeArchivedChannels {
+		query += " AND Channels.DeleteAt = 0"
+	}
 	if err := s.GetReplicaX().Get(&dbMember, query, userId, postId); err != nil {
 		return nil, errors.Wrapf(err, "failed to get ChannelMember with postId=%s and userId=%s", postId, userId)
 	}