[IMP] web_editor: only load ice server configuration once

Before this commit, the web editor loaded the configuration for ice
servers each time it was created.  It is useless to do it more than
once, so this commit simply keep the initial value around.

Part-of: odoo/odoo#111571

addons/web_editor/static/src/js/wysiwyg/wysiwyg.js

@@ -63,6 +63,9 @@ const PTP_CLIENT_DISCONNECTED_STATES = [
     'disconnected',
 ];
 
+// this is a local cache for ice server descriptions
+let ICE_SERVERS = null;
+
 const Wysiwyg = Widget.extend({
     defaultOptions: {
         lang: 'odoo',
@@ -611,7 +614,10 @@ const Wysiwyg = Widget.extend({
 
         this._peerToPeerLoading = new Promise(async (resolve) => {
             this._currentRecord = await this._getCurrentRecord();
-            let iceServers = await this._rpc({route: '/web_editor/get_ice_servers'});
+            if (!ICE_SERVERS) {
+                ICE_SERVERS = await this._rpc({route: '/web_editor/get_ice_servers'});
+            }
+            let iceServers = structuredClone(ICE_SERVERS);
             if (!iceServers.length) {
                 iceServers = [
                     {