[MERGE] website(_sale): Improve 'todos' in website's dashboard with minor usability

Purpose
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Todo buttons are too confusing because it's mixing app suggestions & business todos, etc.
It looks empty when ecommerce is not installed

Specification
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[IMP] website(_sale): Improve UX for the website dashboard

    There are some usability issues in the website dashboard

    1/ Move button 'Go to Website' in the header
    2/ Hide the action button bar if there's nothing in it
    3/ Align the labels in the graph's legend
    4/ Make the legend labels and display more obvious
    5/ Modify the graph colors to be more readable
    6/ Remove margins around todo buttons

[IMP] website_sale: Fetch confirmed orders grouped by product templates

    Sales graph should be based on confirmation_date of sales orders, not the date_order.

    Date should be aggregated by product templates, not variants

[IMP] website: Reload website dashboard when coming back from breadcrumb

    When clicking on a dashboard element (eg: an invoice) and modifying it doesn't reload the dashboard, which could be confusing.

[IMP] website_sale: Display correct records on dashboard buttons

    Display the wanted sales orders when clicking on 'Abandoned Carts' or 'Unpaid Orders'

[IMP] website: Remove the suggested app on the website dashboard

[IMP] sale: Rename 'Order Date' into 'Confirmation Date' in SO tree view

[IMP] sale: Don't copy confirmation date on duplication

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