IDEA-121675 Nashorn: Debug: RunToCursor is always disabled when js file is active

use JVMDebugProvider and depecate isJVMDebuggingSupported

platform/core-api/src/com/intellij/openapi/fileTypes/LanguageFileType.java

@@ -62,6 +62,10 @@ public abstract class LanguageFileType implements FileType{
     return null;
   }
 
+  /**
+   * @deprecated implement own {@link com.intellij.debugger.engine.JVMDebugProvider} instead
+   */
+  @Deprecated
   public boolean isJVMDebuggingSupported() {
     return false;
   }