Return Set<Class<?>> from Module "get test" methods

[labkey-adam]

Rationale

Eliminate IntelliJ warnings caused by Module methods getUnitTests() and getIntegrationTests() returning raw Set<Class>; they now return Set<Class<?>>.

Also, eliminate use of the deprecated AbstractAuditTypeProvider() constructor and overrides of getDomainKind() in its subclasses; we now always call the constructor that passes in a DomainKind.