This commit benefits from a feature introduced in AssertJ 3.26.0, see
https://github.com/assertj/assertj/pull/3377.
This allows to use any AssertFactory and convert the actual value to
the type the factory manages. Previously, we were using
ParameterizedTypeReference to express the type with its generic
signature but the returned assert object would not be narrowed to the
converted type.
Thanks to this change, we can request to convert the actual value to
`InstanceOfAssertFactories.list(Member.class)` and get a `ListAssert`
of `Member` as a result, rather than an `ObjectAssert` of `List<User>`.
Thanks very much to @scordio for his efforts.
Closes gh-32953
aa4b226a22