MM-45174 - split validate business email logic (#20581)

* MM-45174 - split validate business email logic

* remove unnecessary interface method

* check for error just after the cloud call to prevent server panic

Co-authored-by: Pablo Velez Vidal <pablo.velez@mattermost.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/client4.go

@@ -7916,6 +7916,16 @@ func (c *Client4) RequestCloudTrial(email *StartCloudTrialRequest) (*Subscriptio
 	return subscription, BuildResponse(r), nil
 }
 
+func (c *Client4) ValidateWorkspaceBusinessEmail() (*Response, error) {
+	r, err := c.DoAPIPost(c.cloudRoute()+"/validate-workspace-business-email", "")
+	if err != nil {
+		return BuildResponse(r), err
+	}
+	defer closeBody(r)
+
+	return BuildResponse(r), nil
+}
+
 func (c *Client4) NotifyAdmin(nr *NotifyAdminToUpgradeRequest) int {
 	nrJSON, jsonErr := json.Marshal(nr)
 	if jsonErr != nil {