[JENKINS-64356] fix legacyIds missing when creating jobs via REST API…

… or CLI (#9303)

* [JENKINS-64356] call onCreatedFromScratch after creating item via api or cli

When creating jobs via the rest api or cli the call to
onCreatedFromScratch was missing. This can lead to long startup times
when many jobs are created this way.

* remove unused import

core/src/main/java/hudson/model/ItemGroupMixIn.java

@@ -290,6 +290,7 @@ public synchronized TopLevelItem createProjectFromXML(String name, InputStream x
 
             add(result);
 
+            result.onCreatedFromScratch();
             ItemListener.fireOnCreated(result);
             Jenkins.get().rebuildDependencyGraphAsync();
 

test/src/test/java/jenkins/model/RunIdMigratorTest.java

@@ -39,7 +39,6 @@
 import java.nio.charset.StandardCharsets;
 import org.htmlunit.HttpMethod;
 import org.htmlunit.WebRequest;
-import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
 import org.jvnet.hudson.test.Issue;
@@ -58,7 +57,6 @@ public void legacyIdsPresent() throws Exception {
         assertTrue(legacyIds.exists());
     }
 
-    @Ignore("TODO Item#onCreatedFromScratch is not called")
     @Issue("JENKINS-64356")
     @Test
     public void legacyIdsPresentViaRestApi() throws Exception {
@@ -82,7 +80,6 @@ public void legacyIdsPresentViaRestApi() throws Exception {
         assertTrue(legacyIds.exists());
     }
 
-    @Ignore("TODO Item#onCreatedFromScratch is not called")
     @Issue("JENKINS-64356")
     @Test
     public void legacyIdsPresentViaCli() {