[12.x] memoize result of Application@eventsAreCached()
#57709
+41
−12
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Similar to #57687 and #57665
This probably doesn't provide a lot of real value, given that it's unlikely someone calls
EventServiceProvider@getEvents()more than a single time in their application. This does maintain consistency, and paves the way for someone who might want to create aWithCachedEventstesting trait.