Don't warn about missing Freemarker templates if disabled

[chrylis]

The FreeMarkerAutoConfiguration logs a warning about missing templates even if the entire auto-configuration class is disabled via properties. I am using FreeMarker internally for non-Web reasons, but its presence triggers spurious warnings from the auto-configuration even after adding spring.freemarker.enabled: false.

[philwebb]

The spring.freemarker.enabled property is somewhat poorly named. It's actually documented as "Whether to enable MVC view resolution for this technology".

I don't think we can apply the fix that you suggest because we have FreeMarkerNonWebConfiguration which will apply even if spring.freemarker.enabled is false and calls factory.setTemplateLoaderPaths(this.properties.getTemplateLoaderPath()); (via AbstractFreeMarkerConfiguration).

Setting spring.freemarker.check-template-location to false should stop the warning.

[chrylis]

This behavior conflicts with general behavior of other enabled properties, which is to shut off the relevant auto-configuration bean registrations entirely. I'm aware that this is a backward-compatibility issue, but I suggest that for Boot 3 the property spring.freemarker.enabled should actually prevent Boot from registering any beans related to FreeMarker; as it is, I'd have to actively exclude the base auto-configuration class itself.