[HttpKernel] Deprecate returning a ContainerBuilder from KernelInterface::registerContainerConfiguration()
#40432
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This behavior was introduced in 38aef98#diff-7753dd9020accbf6eb7c3dbb86a992340ce9dff4a0258458d7bbdd0a3d396939R261
But this is never used nor tested AFAIK, and the interface doesn't document it.