Job does not exists error get ovverriden by Invalid task type error

[developernext]

Describe the bug
In scheduler.models.task the function get_scheduled_task raise the wrong error when a task is not found.

To Reproduce

1. Have a valid task of type CronTaskType
2. Open a django shell
3. import the function and it's dependecies
4. run get_scheduled_task using the right type and id
5. update the id to a non existing one
6. you get

Traceback (most recent call last):
File "", line 1, in
File "", line 11, in get_scheduled_task
ValueError: Invalid task type CronTaskType

Expected behavior
You should get Job does not exists error

Desktop (please complete the following information):

• OS: Ubuntu 24.04
• python version: 3.12
• django version: 5.2