Stack of exception in EnsoLibraryFeature is printed to System.err.

The current printing is not visible on CI

engine/runner/src/main/java/org/enso/runner/EnsoLibraryFeature.java

@@ -105,7 +105,7 @@ public void beforeAnalysis(BeforeAnalysisAccess access) {
         }
       }
     } catch (Exception ex) {
-      ex.printStackTrace();
+      ex.printStackTrace(System.err);
       throw new IllegalStateException(ex);
     }
     System.err.println("Summary for polyglot import java:");