Resolve @RedisListener consumes placeholders

[DragonFSKY]

Related to #3393.

This resolves embedded property placeholders in the @RedisListener consumes attribute before setting the listener endpoint content type. Without this, values such as ${app.redis.content-type} are propagated literally as the synthetic MessageHeaders.CONTENT_TYPE, preventing configured content negotiation from being applied.

Tests: ./mvnw -Dtest=RedisListenerAnnotationBeanPostProcessorIntegrationTests,RedisListenerEndpointConversionUnitTests test

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