[JPS] Ignore classpath from facets to exclude jars from gradle build

Reimport after `./gradlew build` adds jars from gradle's `build/libs` to facet's classpath. That causes problems with JPS build, because it doesn't see changes in out folder, but see unchanged jar, so changes don't apply.

#KT-51873 Fixed

Merge-request: KT-MR-6018
Merged-by: Aleksei Cherepanov <aleksei.cherepanov@jetbrains.com>

jps/jps-common/src/org/jetbrains/kotlin/config/KotlinFacetSettings.kt

@@ -175,6 +175,7 @@ class KotlinFacetSettings {
                 if (compilerSettings != null) {
                     parseCommandLineArguments(compilerSettings.additionalArgumentsAsList, this)
                 }
+                if (this is K2JVMCompilerArguments) this.classpath = ""
             }
         } else null
     }