(core) Add tip for "Add New" button

Summary:
Adds a new tip for the doc menu's Add New button. The tip is
shown only when the current user is an editor or owner, and
the site is non-empty. The presence of welcome videos or
popups will also cause the tip to not be shown; it will instead
be shown the next time the doc menu is visited.

Test Plan: Browser tests.

Reviewers: jarek

Reviewed By: jarek

Differential Revision: https://phab.getgrist.com/D3757

app/client/widgets/FieldBuilder.ts

@@ -294,7 +294,7 @@ export class FieldBuilder extends Disposable {
             }
 
             if (op.label === 'Reference') {
-              return this.gristDoc.behavioralPrompts.attachTip('referenceColumns', {
+              return this.gristDoc.behavioralPromptsManager.attachTip('referenceColumns', {
                 popupOptions: {
                   attach: `.${cssTypeSelectMenu.className}`,
                   placement: 'left-start',
@@ -370,7 +370,7 @@ export class FieldBuilder extends Disposable {
     });
     return [
       cssLabel('DATA FROM TABLE',
-        !this._showRefConfigPopup.peek() ? null : this.gristDoc.behavioralPrompts.attachTip(
+        !this._showRefConfigPopup.peek() ? null : this.gristDoc.behavioralPromptsManager.attachTip(
           'referenceColumnsConfig',
           {
             onDispose: () => this._showRefConfigPopup(false),