Allow IntervalSchedule to use a custom schedule type.

[sdrabblescripta]

No description provided.

[auvipy]

we will need tests to verify the proposed changes

[sdrabblescripta]

Of course, and I planned on adding them but I'm unable to run the current test suite so if you could provide advice on how to do that successfully (tox -e py38 returns a bunch of errors) then I'll be happy to add new tests.

[auvipy]

can you please describe why we actually need this?

[Copilot]

Pull Request Overview

This PR enables the IntervalSchedule model to support a custom schedule type by allowing a dynamic assignment of the schedule class.

• Introduces a new attribute (schedule_cls) to hold the schedule class
• Modifies the schedule property to use schedule_cls instead of a hardcoded schedule
• Updates the from_schedule class method to assign schedule_cls based on the provided schedule

Comments suppressed due to low confidence (1)

django_celery_beat/models.py:149

• [nitpick] The attribute 'schedule_cls' could be misleading due to its leading and trailing underscores, which are typically reserved for special methods. Consider renaming it to 'schedule_cls' for clarity.

+    _schedule_cls_ = schedules.schedule