build: Simplify tutor initialization #18

Job	Run time
tests (ubuntu-latest, 3.12, django52)	30s
tests (ubuntu-latest, 3.12, docs)	26s
tests (ubuntu-latest, 3.12, django60)	29s
tests (ubuntu-latest, 3.12, quality)	21s
tests (ubuntu-latest, 3.12, pii_check)	16s
	2m 2s

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