Fix e2e Flaky Apps/Job BackoffLimit test

This fix is linked to the PR kubernetes#51153 that introduce the
JobSpec.BackoffLimit.
Previously the Timeout used in the test was too agressive and generates
flaky test execution. Now it used the default framework.JobTimeout used
in others tests.

test/e2e/apps/job.go

@@ -181,7 +181,7 @@ var _ = SIGDescribe("Job", func() {
 		Expect(err).NotTo(HaveOccurred())
 		By("Ensuring job exceed backofflimit")
 
-		err = framework.WaitForJobFailure(f.ClientSet, f.Namespace.Name, job.Name, time.Duration(30)*time.Second, "BackoffLimitExceeded")
+		err = framework.WaitForJobFailure(f.ClientSet, f.Namespace.Name, job.Name, framework.JobTimeout, "BackoffLimitExceeded")
 		Expect(err).NotTo(HaveOccurred())
 
 		By("Checking that only one pod created and status is failed")