BO - is_graded flag not set during course run selection

[NamFra]

Bug Report

Problematic behavior
In Joanie's BO, the is_graded flag doesn't work correctly after selecting course runs.
The switch is still set to false after saving:

<input class="PrivateSwitchBase-input MuiSwitch-input css-j8yymo" name="is_graded" type="checkbox" value="false">

It only updates if the added course is edited manually afterward. This can be easily overlooked and causes configuration issues.

Expected behavior/code
The flag should be set to true after selecting course runs and saving, without needing any further action.

Steps to Reproduce

1. Go to Joanie's back office and create a product, filling in all required fields.
2. When selecting target courses, pick specific course runs and enable the "Taken into account for certification" switch.
3. Save the product and check: the certification option is not applied.

joanie-taken-into-account-certification.webm

Environment

• Joanie version: 2.11.0
• Platform: back-office

Additional context/Screenshots

Related to d329e6c