Prior to this commit, we set in gh-37388 the ObservationRegistry on the
auto-configured JmsTemplate bean. This enables observations and context
propagation when sending JMS messages.
This commit applies the same to the `DefaultJmsListenerContainerFactory`
and the `DefaultJmsListenerContainerFactoryConfigurer`, in order to
enable observations on `@JmsListener` annotated methods.
This commit also refactors the support implemented in gh-37388 to avoid
relying on a bean post processor and instead set the observation
registry directly in the main auto-configuration: while Micrometer core
is an actuator-only dependency, Micrometer Observation API is a compile
dependnecy for spring-jms itself and there is no need to separate
concerns there.
Fixes gh-38613
0321a8a05b