This commit migrates `AnnotationConfigReactiveWebApplicationContext` parent to the `GenericApplicationContext` abstraction. Any use of `AnnotationConfigWebApplicationContext` is also removed as it also inherits from the `AbstractRefreshableApplicationContext` outdated hierarchy. A new `AnnotationConfigServletWebApplicationContext` context is introduced instead, extending from `GenericApplicationContext` and providing the counter part of the reactive context for the Servlet-based web app tests. See gh-16096  | 
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