This update simplifies the underlying code for our account reporting modules. As part of a larger migration, the team has replaced older components (`t-custom-model`) with newer, more efficient structures (`t-model` and `t-model.proxy`). This ensures continued stability and performance.

* = [accountant_knowledge]

As part of the migration from `owl 2` to `owl 3`, this commit replaces uses of `t-custom-model` with `t-model` or `t-model.proxy`.

community: https://github.com/odoo/odoo/pull/269573