[FIX] website_event_meet, *: properly await edit option before reload

*: website_sale

This is a follow-up of [1], which missed some occurrence of the same
issue that it fixed.

E.g.
- Add a delay to the "write" of the event model
- Go to /event/<event_id>/community
- Enter edit mode
- Click on the page
- Enable the room creation option
=> The page reloads but nothing seems to have been done... it is
   actually *being* done: the page reloaded too soon.

Note: this commit also marks some other occurrences which are not buggy
but might be in the future if not properly changed. To be adapted in the
master forward-port.

[1]: 556ae45

closes #159316

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/website_event_meet/static/src/js/snippets/options.js

@@ -29,12 +29,14 @@ options.registry.WebsiteEvent.include({
      * @see this.selectClass for parameters
      */
     allowRoomCreation(previewMode, widgetValue, params) {
-        this._rpc({
+        return this._rpc({
             model: 'event.event',
             method: 'write',
             args: [[this.eventId], {
                 meeting_room_allow_creation: widgetValue
             }],
+        // TODO: Remove the request_save in master, it's already done by the
+        // data-page-options set to true in the template.
         }).then(() => this.trigger_up('request_save', {reload: true, optionSelector: this.data.selector}));
     },
 

addons/website_sale/static/src/js/website_sale.editor.js

@@ -431,6 +431,7 @@ options.registry.WebsiteSaleProductsItem = options.Class.extend({
      * @see this.selectClass for params
      */
     changeSequence: function (previewMode, widgetValue, params) {
+        // TODO this should be awaited
         this._rpc({
             route: '/shop/config/product',
             params: {
@@ -638,6 +639,7 @@ options.registry.WebsiteSaleProductsItem = options.Class.extend({
         var $td = $(ev.currentTarget);
         var x = $td.index() + 1;
         var y = $td.parent().index() + 1
+        // TODO this should be awaited somehow
         this._rpc({
             route: '/shop/config/product',
             params: {
@@ -811,6 +813,7 @@ options.registry.WebsiteSaleProductPage = options.Class.extend({
      * Removes all extra-images from the product.
      */
     clearImages: function () {
+        // TODO this should be awaited
         this._rpc({
             route: `/shop/product/clear-images`,
             params: {
@@ -918,6 +921,7 @@ options.registry.WebsiteSaleProductAttribute = options.Class.extend({
      * @see this.selectClass for params
      */
     setDisplayType: function (previewMode, widgetValue, params) {
+        // TODO this should be awaited
         this._rpc({
             route: '/shop/config/attribute',
             params: {
@@ -983,6 +987,7 @@ options.registry.ReplaceMedia.include({
      * 
      */
     async setPosition(previewMode, widgetValue, params) {
+        // TODO this should be awaited
         this._rpc({
             route: '/shop/product/resequence-image',
             params: {