[FIX] account_reports: returns: fix generations of files as attachments

_generate_submission_attachments does not exist anymore ; it's been renamed to _generate_locking_attachments. Because of that, some intended overrides were not executed properly, and several XML/CSV export files were not generated and added as attachments to the return.

Moreover, the functions generating export files used to be called by account.report's export_file function (from a button defined in options['buttons']). export_file always forced the 'export_mode' key into the options it passed tp those file generators; we reintroduce this behavior for consistency, to avoid messy situations due to forward-port or functions being converted from the former paradigm to the new one. Note, however, it's always better to fully regenerate the options from such a generator.


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[FIX] account_reports: returns: homogenize the reset behavior

Before this fix, resetting a tax report deleted all the attachments of the return, while resetting for example the Partner VAT Listing (in Belgium), left them untouched. We now introduce a common helper for all reset functions, defining the behaviors they should share.

**Steps to reproduce:**
* Install the **Accounting** and **l10n_br_edi** modules.
* Create and post a Brazilian customer invoice using an **Avatax fiscal position**
* [Guide to setup EDI for l10n_br](https://docs.google.com/document/d/1CSUKpnyhty5WBqUDBE-7dGvu0qxaC5vQ0loz0fYNg04/edit?tab=t.0)
* Confirm the invoice and **send it to e-invoice (Brazil)**.
* Confirm the **Brazil E-Invoice Status** shows **'Accepted'**.
* Click **Request Cancellation**, enter a cancellation reason, and submit the request.

**Observed behavior:**
* The invoice moves to **Cancelled** state.
* The cancellation XML is generated and attached in the chatter.
* SEFAZ returns a successful cancellation response.
* However, the **BR EDI Status** becomes **empty**, instead of reflecting **'Cancelled'**.

**Cause:**
* In the wizard `l10n_br_edi.invoice.update`, both `_finalize_update()` and `_submit_services()` assign `l10n_br_last_edi_status = 'cancelled'` **before** calling `button_cancel()`.
* `button_cancel()` internally triggers `button_draft()` for posted invoices.
* The Brazil EDI override of `button_draft()` resets `l10n_br_last_edi_status = False`.
* This clears the status that was just set, leaving the field blank.

**Fix:**
* move `l10n_br_last_edi_status = "cancelled"` to `button_cancel()` method.

opw-5378542

Forward-Port-Of: odoo/enterprise#101438

We had a bug when attempting to refund orders that were created with the "Consumidor Final Anónimo" customer. The refund validation would crash with a TypeError instead of showing the proper error message.

Steps to reproduce:
-------------------
In POS with l10n_cl_edi module activated:
* Create a new order with "Consumidor Final Anónimo" as customer
* Add products and pay the order
* Validate the order
* Attempt to refund this order

> Observation:
The refund validation would crash with:
TypeError: Cannot read properties of undefined (reading 'add') at OrderPaymentValidation.isOrderValid

Why the fix:
------------
The code was trying to access `this.dialog` which is undefined in the OrderPaymentValidation class context. The dialog service should be accessed via `this.pos.dialog`, which is the correct pattern used throughout the base OrderPaymentValidation class. This fix ensures the error dialog is properly displayed when attempting to refund orders for the anonymous final consumer, instead of crashing with a TypeError.