This change is needed because otherwise, source files that are not Java will be added as `JavaSourceRoot`, this is incorrect and causes assertion error in `com.intellij.core.JavaCoreProjectEnvironment.addSourcesToClasspath`. Refer to KT-65325 for more context.
Merge-request: KT-MR-14088
Merged-by: Xuan Son Trinh <xuanson.trinh@jetbrains.com>
Xuan-Son Trinh