fix: support serialization of Vaadin scoped beans (#20394) (CP: 24.4) #20430
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Makes sure that VaadinSession and UI thread locals are available during both serialization and deserialization, to allow other libraries to perform inspection and injection of Vaadin scoped beans.
Also refactors VaadinRouteScope to be independent from VaadinService when fetching RouteScopeOwner annotation for the bean, and replaces VaadinSession.unlock() calls with direct access to the lock instance to prevent unwanted push during bean lookup.
Fixes #19967
Part of vaadin/kubernetes-kit#140