Enable "Late submission penalty" plugin

1. Go to "Grades > Grade penalties > Manage penalty plugins* in site administration:
   • Click on 'toggle' button to enable 'Late submission penalties' plugin
2. Go to "Grades > Grade penalties > Late submission penalties > Penalty rules":
   • Create some penalty rules

Enable "Grade penalty" for assignment

1. Go to "Grades > Grade penalties > Supported modules":
   • Click to select "Assignment"
   • Save changes

Testing: Penalty implementation on an assignment

1. Create a test course
2. Create an assignment in the course:
   1. Set due date to "Yesterday" / a date in the past
   2. Submission types: File submissions
   3. Make sure grade type is set to point
   4. Enable "Grade penalties" under "Grade" section
3. Enrol a student to the course
4. Login as the student
5. Add an submission
6. Log in as an teacher give "0" grade to the submission. Expected behavior:
   1. There is no error when Zero grade is given

Code verified against automated checks.

Checked MDL-84998 using repository: https://github.com/catalyst/moodle

• main (0 errors / 0 warnings) [branch: MDL-84998_main | CI Job]

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