Leverage ObjectProvider instead of autowired containers [SPR-17327]

[spring-projects-issues]

Sébastien Deleuze opened SPR-17327 and commented

In order to be able to leverage WebFlux configuration in a functional way, WebHttpHandlerBuilder and RouterFunctionMapping should leverage new ObjectProvider capabilities to get a sorted list of beans by type instead of using autowired containers.

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Referenced from: pull request #1976