[JENKINS-31884] Integration test for Git webhooks in multibranch proj…

…ects.

Originally-Committed-As: 1fd0023a0cfb1f0d0aa0dd069371e58ae24d208d

multibranch/src/test/java/org/jenkinsci/plugins/workflow/multibranch/SCMBinderTest.java

@@ -123,7 +123,8 @@
                 sampleGitRepo.write("file", "subsequent content");
                 sampleGitRepo.git("commit", "--all", "--message=tweaked");
                 SemaphoreStep.success("wait/1", null);
-                WorkflowRun b2 = story.j.assertBuildStatusSuccess(p.scheduleBuild2(0));
+                sampleGitRepo.notifyCommit(story.j);
+                WorkflowRun b2 = p.getLastBuild();
                 assertEquals(2, b2.getNumber());
                 story.j.assertLogContains("initial content", story.j.waitForCompletion(b1));
                 story.j.assertLogContains("SUBSEQUENT CONTENT", b2);