Previously, when Actuator expected to find multiple beans of the same
type, it used Map<String, Type> to inject them. Unfortunately, this
does not include beans that are not default candidates and there's
no way to request that autowiring includes such beans with Map-based
injection.
This commit switches from Map-based injection to querying the bean
factory for the desired beans. This is done using
SimpleAutowireCandidateResolver's new helper method,
resolveAutowireCandidates, that returns a Map<String, Type> of
beans including those that are not default candidates but excluding
those that are not autowire candidates.
Closes gh-43481