Backport "Fix main class discovery for KotlinModule
"
#4803
Merged
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Backports #4797
Fixes #4772
Previously it inherited the Zinc-based main class discovery via JavaModule, which overrode the generic classpath-scanning approach from RunModule. This PR adjusts the overrides such the KotlinModule uses the disk-based discovery API.
Removed all the now-unnecessary def mainClass annotations in the kotlinlib example tests, except for the one in example/kotlinlib/module/1-common-config that is useful for educational purposes.