The old tree views don't really exist anymore, this odd pseudo-flag to
dispatch between "list" and "tree" tree views has no reason to remain.

Task 1937686

closes odoo/odoo#31243

Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

We would like to make the "no item found" screens more appealing.

Before this commit, it shows a small help tip in the top-left
corner of the screen, just below the "Create" button.

With this commit, these help tips have been replaced by onboarding
screens, which consist of a picture and some text below, both of which
are horizontally centered.

The texts have been slightly changed, so that they are shorter and clearer.

Considered modules:

(A)
    account,
    account_asset,
    account_budget,
    account_test,
    account_voucher,
    analytic
(B)
    barcodes,
    base,
    base_automation,
    board
(C)
    calendar,
    contacts,
    crm
(D)
    delivery
(E)
    event
(F)
    fleet
(G)
    gamification,
    google_drive
(H)
    hr,
    hr_attendance,
    hr_contract,
    hr_expense,
    hr_gamification,
    hr_holidays,
    hr_payroll,
    hr_recruitment,
    hr_timesheet
(I)
    im_livechat
(L)
    l10n_fr_sale_closing,
    link_tracker,
    lunch
(M)
    mail,
    maintenance,
    mass_mailing,
    membership,
    mrp
(N)
    note
(P)
    payment,
    point_of_sale,
    post_mercury,
    pos_restaurant,
    product,
    project,
    purchase,
    purchase_requisition
(R)
    rating,
    repair,
    resource
(S)
    sale,
    sale_timesheet,
    sales_team,
    stock,
    stock_account,
    stock_landed_costs,
    stock_picking_batch,
    survey
(U)
    utm
(W)
    web,
    website,
    website_blog,
    website_customer,
    website_event_track,
    website_forum,
    website_quote,
    website_sale,
    website_sale_digital,
    website_slides

Purpose
=======

Improve readability on mobile

Specification
=============

Activate Kanban view on those so it could be displayed by default on mobile instead of view list

List of impacted modules:

- stock: kanban for incoming products

- stock_picking_wave: kanban for picking waves

- stock: kanban for reordering rules

- stock: kanban for inventory adjustments

- stock: kanban for stock moves

- purchase_requisition: kanban for purchase agreement

- purchase_requisition: kanban for purchase agreement types

- procurement: kanban for procurement exceptions

- mrp: kanban for unbuild orders

- mrp: kanban for waiting availability mo

- mrp: kanban for routing

- mrp: kanban for bill of materials

- mrp_repair: kanban for repair orders

- mrp : kanban for work order messages

- mrp : kanban for productivity losses

- mrp : kanban for Orders to Plan(reuse Manufacturing Orders

- mrp : kanban for work centers(reuse Work Centers Dashboard)

- maintenance: kanban for equipment categories

- barcode : kanban for barcode nomenclatures