Improve AuthorizationManager configuration error messages (#16193) #16194
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Users that are migrating from Spring 5.x don't know that the AuthorizationManager is turned on by default in 6.x and incompatible with their existing Access Decision Manager configuration.
This improvement to the error message with help to bring their attention to the relevant option that is true by default. It will also prevent them from wasting time and looking at where they implement or wire an AuthorizationManager instance.
Closes #16193