PADV-1418 feat: adds a new custom content jsonfield to ccx model #158

Job	Run time
collect-and-verify (3.8, 3.2)	3m 23s
gh-hosted-python-3.8,django-3.2,lms-1	2m 6s
gh-hosted-python-3.8,django-3.2,lms-2	2m 11s
gh-hosted-python-3.8,django-3.2,lms-3	2m 18s
gh-hosted-python-3.8,django-3.2,lms-4	2m 15s
gh-hosted-python-3.8,django-3.2,lms-5	2m 13s
gh-hosted-python-3.8,django-3.2,lms-6	3m 1s
gh-hosted-python-3.8,django-3.2,openedx-1	2m 15s
gh-hosted-python-3.8,django-3.2,openedx-2	2m 50s
gh-hosted-python-3.8,django-3.2,openedx-3	2m 36s
gh-hosted-python-3.8,django-3.2,openedx-4	2m 11s
gh-hosted-python-3.8,django-3.2,cms-1	2m 27s
gh-hosted-python-3.8,django-3.2,cms-2	2m 3s
gh-hosted-python-3.8,django-3.2,common-1	2m 5s
gh-hosted-python-3.8,django-3.2,common-2	2m 10s
gh-hosted-python-3.8,django-3.2,xmodule-1	2m 15s
	38m 19s

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