[PL] Lower the default PL engine messages log level down to INFO

^KT-59136

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/linkage/partial/PartialLinkageConfig.kt

@@ -34,7 +34,7 @@ enum class PartialLinkageLogLevel {
     INFO, WARNING, ERROR;
 
     companion object {
-        val DEFAULT = WARNING
+        val DEFAULT = INFO
 
         fun resolveLogLevel(key: String): PartialLinkageLogLevel? =
             values().firstOrNull { entry -> entry.name.equals(key, ignoreCase = true) }