fix: remove modulestore init to avoid pymongo deadlocks #236

Job	Run time
collect-and-verify (3.8, 3.2)	5m 11s
gh-hosted-python-3.8,django-3.2,lms-1	12m 34s
gh-hosted-python-3.8,django-3.2,lms-2	8m 35s
gh-hosted-python-3.8,django-3.2,lms-3	17m 18s
gh-hosted-python-3.8,django-3.2,lms-4	15m 57s
gh-hosted-python-3.8,django-3.2,lms-5	11m 2s
gh-hosted-python-3.8,django-3.2,lms-6	13m 38s
gh-hosted-python-3.8,django-3.2,openedx-1	13m 14s
gh-hosted-python-3.8,django-3.2,openedx-2	13m 14s
gh-hosted-python-3.8,django-3.2,openedx-3	9m 12s
gh-hosted-python-3.8,django-3.2,openedx-4	5m 40s
gh-hosted-python-3.8,django-3.2,cms-1	5m 9s
gh-hosted-python-3.8,django-3.2,cms-2	16m 26s
gh-hosted-python-3.8,django-3.2,common-1	9m 41s
gh-hosted-python-3.8,django-3.2,common-2	11m 8s
gh-hosted-python-3.8,django-3.2,common-3	5m 53s
	2h 53m 52s

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