Remove JSONP support [SPR-16914]

[spring-projects-issues]

Sébastien Deleuze opened SPR-16914 and commented

Since JSONP support is going to be deprecated in 4.3.x and 5.0.x branches, let's remove it in 5.1 in favor of CORS support which is now widely supported in browsers.

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Issue Links:

• Deprecate JSONP support and update MappingJackson2JsonView defaults [SPR-16798] #21338 Deprecate JSONP support and update MappingJackson2JsonView defaults

Referenced from: commits spring-projects/spring-integration@eb1efdb