[JENKINS-73824] Wait for Pipeline builds to complete before allowing …

…their jobs to be deleted (jenkinsci#9790)

* Wait for Pipelines to complete before allowing their jobs to be deleted

* Create mock Job/Run classes that use AsynchronousExecution to be able to add a regression test in core

* [JENKINS-73824] Do not repeatedly interrupt executables in ItemDeletion.cancelBuildsInProgress

* [JENKINS-73824] Delete ItemDeletionTest based on jenkinsci#9790 (comment)

core/src/main/java/jenkins/model/queue/ItemDeletion.java

@@ -266,12 +266,10 @@ public static void cancelBuildsInProgress(@NonNull Item initiatingItem) throws F
                     // comparison with executor.getCurrentExecutable() == executable currently should always be
                     // true as we no longer recycle Executors, but safer to future-proof in case we ever
                     // revisit recycling.
-                    if (!entry.getKey().isAlive()
+                    if (!entry.getKey().isActive()
                             || entry.getValue() != entry.getKey().getCurrentExecutable()) {
                         iterator.remove();
                     }
-                    // I don't know why, but we have to keep interrupting
-                    entry.getKey().interrupt(Result.ABORTED);
                 }
                 Thread.sleep(50L);
             }