Prior to this commit, the `GraphQlTesterContextCustomizer` would
register a `WebGraphQlTester` instance as a `GraphQlTester` bean., only
exposing the `GraphQlTester` type. This is not in line with the
documentation and also does not register the bean definition with the
most specific type.
With this issue, a `@SpringBootTest` integration test will not be
injected with a `WebGraphQlTester` if it asks one.
This commit ensures that the `WebGraphQlTester` is registered as such
and that all related classes are renamed as a result.
Fixes gh-29250
0d616b8924