Produce a warning when 'mergeServiceFiles()' is enabled with incompatible 'duplicatesStrategy'

### What feature do you want to see added? According to [documentation](https://gradleup.com/shadow/configuration/merging/#handling-duplicates-strategy) `mergeServiceFiles()` does not work with `DuplicatesStrategy.EXCLUDE`, which is the default in `ShadowJar` task. Please add a warning when `mergeServiceFiles()` is enabled and an incompatible `DuplicatesStrategy` is configured. This should reduce users' confusion on why service files were not merged and prevent long investigation times. Maybe it should be a more generic solution for `ResourceTransform` - compatible `DuplicateStragegy` values are defined in the transform implementation, and the plugin produces warnings according to the list. ### Upstream changes _No response_ ### Are you interested in contributing this feature? _No response_