ENH: apply paging such that no unwanted jobs are being triggered

Summary

Performance was bad because a paged retrieve would also load and execute jobs for entities which are not on the requested page.

Focus

Two things happened:

1. There was a trivial but wrong implementation of Entity#skipJob(). Jobs would never be skipped, even if an entity had entity status IGNORE. This was a one-liner.
2. Because the paging was being applied after the query (and other jobs) some (and possibly A LOT) entity jobs would be added to the schedule which are not necessary because the entities are not the requested page. This is the rest of the changes.

Test Environment

Unit test should be sufficient.

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• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
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Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
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src/main/java/org/caosdb/server/entity/xml/ParentToElementStrategy.java

@@ -26,7 +26,6 @@ package org.caosdb.server.entity.xml;
 
 import org.caosdb.server.entity.EntityInterface;
 import org.caosdb.server.entity.wrapper.Parent;
-import org.caosdb.server.utils.EntityStatus;
 import org.jdom2.Element;
 
 /**
@@ -51,15 +50,4 @@ public class ParentToElementStrategy extends EntityToElementStrategy {
     }
     return element;
   }
-
-  @Override
-  public Element addToElement(
-      final EntityInterface entity,
-      final Element element,
-      final SerializeFieldStrategy setFieldStrategy) {
-    if (entity.getEntityStatus() != EntityStatus.IGNORE) {
-      element.addContent(toElement(entity, setFieldStrategy));
-    }
-    return element;
-  }
 }