chore!: allow CreateUser to accept multiple organizations (#14383)

* chore: allow CreateUser to accept multiple organizations

In a multi-org deployment, it makes more sense to allow for multiple
org memberships to be assigned at create. The legacy param will still
be honored.

* Handle sdk deprecation better by maintaining cli functions

scaletest/createworkspaces/run.go

@@ -72,11 +72,11 @@ func (r *Runner) Run(ctx context.Context, id string, logs io.Writer) error {
 
 		_, _ = fmt.Fprintln(logs, "Creating user:")
 
-		user, err = r.client.CreateUser(ctx, codersdk.CreateUserRequest{
-			OrganizationID: r.cfg.User.OrganizationID,
-			Username:       r.cfg.User.Username,
-			Email:          r.cfg.User.Email,
-			Password:       password,
+		user, err = r.client.CreateUserWithOrgs(ctx, codersdk.CreateUserRequestWithOrgs{
+			OrganizationIDs: []uuid.UUID{r.cfg.User.OrganizationID},
+			Username:        r.cfg.User.Username,
+			Email:           r.cfg.User.Email,
+			Password:        password,
 		})
 		if err != nil {
 			return xerrors.Errorf("create user: %w", err)