Restrict the remaining V4 API endpoints to authenticated users

[albertisfu]

Describe the issue.

In #6249 we blocked the main impacted API endpoints. However, we still need to restrict the following endpoints and update the API changelog.

Audio:

• AudioViewSet

People:

• PersonDisclosureViewSet
• PersonViewSet
• PositionViewSet
• RetentionEventViewSet
• EducationViewSet
• SchoolViewSet
• PoliticalAffiliationViewSet
• SourceViewSet
• ABARatingViewSet

Search:

• OriginatingCourtInformationViewSet
• CourtViewSet
• OpinionsCitedViewSet
• SearchV4ViewSet

Disclosures:

• AgreementViewSet
• DebtViewSet
• FinancialDisclosureViewSet
• GiftViewSet
• InvestmentViewSet
• NonInvestmentIncomeViewSet
• PositionViewSet
• ReimbursementViewSet
• SpouseIncomeViewSet

It's a good idea to split the work into different PRs so it's easier to review and fix tests.

We should also fix the generic test runner error that often occurs and hides the failing tests.

multiprocessing.pool.MaybeEncodingError: Error sending result: '(183, [('startTest', 0), ('addDuration', 0, 0.049252753000018856), ('addSuccess', 0), ('stopTest', 0), ('startTest', 1), ('addDuration', 1, 0.040155106000042906), ('addSuccess', 1), ('stopTest', 1), ('startTest', 2), ('addDuration', 2, 0.04974200000003748), ('addSuccess', 2), ('stopTest', 2), ('startTest', 3), ('addDuration', 3, 0.052190468000048895), ('addSuccess', 3), ('stopTest', 3), ('startTest', 4), ('addDuration', 4, 0.14158253599998716), ('addSuccess', 4), ('stopTest', 4), ('startTest', 5), ('addDuration', 5, 0.03956204999997226), ('addSuccess', 5), ('stopTest', 5), ('startTest', 6), ('addDuration', 6, 0.9321185519999062), ('addSuccess', 6), ('stopTest', 6), ('startTest', 7), ('addDuration', 7, 0.44426222799995685), ('addSuccess', 7), ('stopTest', 7), ('startTest', 8), ('addDuration', 8, 0.041108146999931705), ('addSuccess', 8), ('stopTest', 8), ('startTest', 9), ('addDuration', 9, 0.05254403699996146), ('addSuccess', 9), ('stopTest', 9), ('startTest', 10), ('addDuration', 10, 0.0649155859999837), ('addSuccess', 10), ('stopTest', 10), ('startTest', 11), ('addDuration', 11, 0.04525529700003972), ('addSuccess', 11), ('stopTest', 11), ('startTest', 12), ('addDuration', 12, 0.04238769799997044), ('addSuccess', 12), ('stopTest', 12), ('startTest', 13), ('addDuration', 13, 0.03890388599995731), ('addSuccess', 13), ('stopTest', 13), ('startTest', 14), ('addDuration', 14, 0.03975175200002923), ('addSuccess', 14), ('stopTest', 14), ('startTest', 15), ...

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What type of issue is this?

Research