MM-44101: GraphQL: Add sidebar categories at the top level (#20178)

Also, add a negate parameter to the team members to get
all sidebarcategories except the default team.

```release-note
NONE
```

api4/team.go

@@ -554,7 +554,7 @@ func getTeamMembersForUser(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	members, err := c.App.GetTeamMembersForUser(c.Params.UserId, true)
+	members, err := c.App.GetTeamMembersForUser(c.Params.UserId, "", true)
 	if err != nil {
 		c.Err = err
 		return