[MM-33198] - Portal: Send admin welcome email after the installation is complete (#17043)

* [MM-33198] - Portal: Send admin welcome email after the installation is complete

* Send cloud welcome email

* Feedback impl-2

* Fix template

* Temp undo

* Update

* make i18n-extract

* Translations

* Feedback impl-3

* More template fixes

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/cloud.go

@@ -3,11 +3,14 @@
 
 package model
 
+import "strings"
+
 const (
-	EventTypeFailedPayment       = "failed-payment"
-	EventTypeFailedPaymentNoCard = "failed-payment-no-card"
-	JoinLimitation               = "join"
-	InviteLimitation             = "invite"
+	EventTypeFailedPayment         = "failed-payment"
+	EventTypeFailedPaymentNoCard   = "failed-payment-no-card"
+	EventTypeSendAdminWelcomeEmail = "send-admin-welcome-email"
+	JoinLimitation                 = "join"
+	InviteLimitation               = "invite"
 )
 
 // Product model represents a product on the cloud system.
@@ -94,6 +97,11 @@ type Subscription struct {
 	LastInvoice *Invoice `json:"last_invoice"`
 }
 
+// GetWorkSpaceNameFromDNS returns the work space name. For example from test.mattermost.cloud.com, it returns test
+func (s *Subscription) GetWorkSpaceNameFromDNS() string {
+	return strings.Split(s.DNS, ".")[0]
+}
+
 // Invoice model represents a cloud invoice
 type Invoice struct {
 	ID             string             `json:"id"`
@@ -121,8 +129,9 @@ type InvoiceLineItem struct {
 }
 
 type CWSWebhookPayload struct {
-	Event         string         `json:"event"`
-	FailedPayment *FailedPayment `json:"failed_payment"`
+	Event               string               `json:"event"`
+	FailedPayment       *FailedPayment       `json:"failed_payment"`
+	CloudWorkspaceOwner *CloudWorkspaceOwner `json:"cloud_workspace_owner"`
 }
 
 type FailedPayment struct {
@@ -131,6 +140,10 @@ type FailedPayment struct {
 	FailureMessage string `json:"failure_message"`
 }
 
+// CloudWorkspaceOwner is part of the CWS Webhook payload that contains information about the user that created the workspace from the CWS
+type CloudWorkspaceOwner struct {
+	UserName string `json:"username"`
+}
 type SubscriptionStats struct {
 	RemainingSeats int    `json:"remaining_seats"`
 	IsPaidTier     string `json:"is_paid_tier"`