refactor: [ACI-502, ACI-503] redesign course grading events payload #533

Job	Run time
collect-and-verify (3.8, 3.2)	2m 18s
gh-hosted-python-3.8,django-3.2,lms-1	2m 26s
gh-hosted-python-3.8,django-3.2,lms-2	2m 30s
gh-hosted-python-3.8,django-3.2,lms-3	2m 21s
gh-hosted-python-3.8,django-3.2,lms-4	2m 6s
gh-hosted-python-3.8,django-3.2,lms-5	2m 23s
gh-hosted-python-3.8,django-3.2,lms-6	2m 22s
gh-hosted-python-3.8,django-3.2,openedx-1	2m 51s
gh-hosted-python-3.8,django-3.2,openedx-2	2m 6s
gh-hosted-python-3.8,django-3.2,openedx-3	2m 6s
gh-hosted-python-3.8,django-3.2,openedx-4	2m 5s
gh-hosted-python-3.8,django-3.2,cms-1	2m 18s
gh-hosted-python-3.8,django-3.2,cms-2	3m 4s
gh-hosted-python-3.8,django-3.2,common-1	2m 4s
gh-hosted-python-3.8,django-3.2,common-2	2m 13s
gh-hosted-python-3.8,django-3.2,xmodule-1	2m 8s
	37m 21s

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