This update consolidates duplicated empty-state messaging used in graph, pivot, and cohort views into one shared component. It reduces maintenance effort and helps keep the user experience consistent when reports have no data to display.

The same template was defined for graph, pivot and cohort views
(only the message sometimes slighlty changed). This rev. creates
one generic template used by those three views.

Description of the issue/feature this PR addresses:

Current behavior before PR:

Desired behavior after PR is merged:




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This update removes an outdated internal coding marker that is no longer needed because the system already treats these methods that way by default. It reduces code clutter and helps developers maintain accounting-related features more consistently, with no expected change for end users.

depends on https://github.com/odoo/odoo/pull/34556

This change removes outdated internal coding patterns across several accounting-related areas, aligning the enterprise codebase with newer platform standards. Business users should not see functional changes, but the cleanup helps maintainability and reduces future upgrade risk.

depends on https://github.com/odoo/odoo/pull/34556 and https://github.com/odoo/odoo/pull/34775