As a follow-up to gh-29277, and since the JAXB support is now triggered by the classpath presence of a JAXB implementation, it makes sense to make SourceHttpMessageConverter, previously configured unconditionally, optional. That makes a big difference on native (1M of RSS reduction with current typical Spring Boot 3 arrangement, 3.4M when other usages of XML are not reachable). It also brings more consistency between Spring MVC and Spring WebFlux, and means that XML support for Spring web applications now needs to be enabled explicitly. As a consequence, Spring web applications using javax.xml.transform.Source now needs to configure SourceHttpMessageConverter explicitly in RestTemplate or Spring MVC. Closes gh-29535
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