feat: add role assignment audit trail (#261) #815

Job	Run time
tests (ubuntu-latest, 3.12, django52)	1m 52s
tests (ubuntu-latest, 3.12, pii_check)	35s
tests (ubuntu-latest, 3.12, docs)	48s
tests (ubuntu-latest, 3.12, quality)	1m 4s
	4m 19s

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