This fix prevents expected promise rejections in the web client from being incorrectly reported as browser console errors, especially in Firefox. It makes error handling more consistent across browsers and reduces misleading noise during troubleshooting without changing user-facing workflows.

This update corrects how coupon program methods are handled so they work properly with multiple records. It helps avoid incorrect behavior in sales coupon processing while keeping the change internal and low risk.

Description of the issue/feature this PR addresses:
In those methods self is recordset.

@rco-odoo 


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The task editing popup no longer shows a worksheet template design button that did not work from that location. Users can still edit worksheet templates through the normal Configuration > Worksheet Templates menu, reducing confusion while preserving the capability.

### Purpose

- When editing a task it was possible to edit a worksheet template. Once clicked, there was a button to edit the template with studio ("Design Worksheet Template"), unfortunately, that was not working.

- The button is not there anymore. Nevertheless, the template can still be edited with studio by going in Configuration > Worksheet Templates > Select template and click on "Design Worksheet Template".