This pull request removes outdated configuration files related to FedEx, UPS, and USPS delivery settings. These files were identified as remnants of a previous development effort and were no longer required within the Odoo Enterprise system. This cleanup simplifies the codebase and improves maintainability.

Oversight of 83d5bc4b0df37e0786348238b7379cb9f62fd5e4 and fw ports

This update simplifies the payment process for self-order POS systems. Due to a recent update in the core Odoo platform (odoo/odoo#231190), payment code previously specific to self-order POS is no longer needed. The updated code now leverages shared payment code from the standard POS module, streamlining operations and reducing complexity.

Since odoo/odoo#231190, payment terminals can now share the same code between the POS and the Kiosk. This means payment code in `pos_self_order_iot` can be removed, since the code from `pos_iot` can be used instead.

This update removes a function that was mistakenly reintroduced in some Odoo forward ports for the Italian and Philippines accounting reports. The function was previously moved to report options, and this fix ensures the system operates with the correct, current configuration. This resolves a potential inconsistency in report generation.

the function _get_custom_display_config was switched to the options on reports in this commit, https://github.com/odoo/enterprise/commit/162d2326b2bd4e78aa742ae7bdd125150faf3e08. Unfortunately, some forward ports missed it and added back this function for both l10n_it and l10n_ph.