[MM-37772] Idiomatic naming (URL, URI, API) (#18128)

* s/Url/URL/g & s/Uri/URI/g

* s/Api/API/g

model/push_notification.go

@@ -64,7 +64,7 @@ type PushNotification struct {
 	SenderId         string `json:"sender_id,omitempty"`
 	SenderName       string `json:"sender_name,omitempty"`
 	OverrideUsername string `json:"override_username,omitempty"`
-	OverrideIconUrl  string `json:"override_icon_url,omitempty"`
+	OverrideIconURL  string `json:"override_icon_url,omitempty"`
 	FromWebhook      string `json:"from_webhook,omitempty"`
 	Version          string `json:"version,omitempty"`
 	IsIdLoaded       bool   `json:"is_id_loaded"`