[10.x] Update routes and events "is cached" check to is_file #49680
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The method that checks for a cached configuration file uses is_file (and was changed a few years back from file_exists during a mass update). These methods weren't updated as they weren't directly calling file_exists, but under the hood that's effectively all this method does after looking up the Filesystem service.
This brings these methods in line with other usages of is_file and trims an unnecessary service lookup from the call stack.