[FIX] web_editor, website: fix website editor as restricted editor

When assigned the role of restricted editor, there are many ways to
break the web_editor when trying to do actions that should be
unavailable. There is a traceback for the following scenarios under
some circumstances (mainly because of pages without editable areas or
features without the proper access rights):

- Drag and dropping snippet when Restricted Editor.
- Clicking on product when Restricted Editor in /shop.
- Clicking on product image on specific product page.
- Clicking on user name (e.g. Marc Demo).
- Clicking on menu items or logo.
- Clicking on a blog's image in /blog.
- Clicking on a blog's image on specific blog page.
- Clicking on calendar's image in /calendar.

There is now no longer a traceback which makes the editor crash or
freeze. This mimics the behavior in other cases where the editor does
not show a traceback, but there is no message indicating that the action
is unauthorized.

When accessing a menu that cannot be edited, the "Edit the menu" button
is not shown to the restricted editor.

task-2747895
opw-3164176

closes odoo/odoo#76900

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>
Co-authored-by: Benjamin Vray <bvr@odoo.com>
Co-authored-by: qsm-odoo <qsm@odoo.com>