TEST: Add 3-minute settling sleep to UDN isolation tests

This is a data collection PR to test whether network timing issues on
RHCOS10+Azure are resolved by allowing more time for network setup to
stabilize before running connectivity checks.

After pods are created and IPs retrieved, wait 3 minutes for:
- OVN flows to be fully installed
- Network policies to be enforced
- Pod networking to stabilize

Using 3 minutes (conservative) to ensure we capture any slow
initialization scenarios on RHCOS10+Azure.

NOT FOR MERGE - data collection only

Author: jluhrsen

test/extended/networking/network_segmentation.go

@@ -329,6 +329,16 @@ var _ = Describe("[sig-network][OCPFeatureGate:NetworkSegmentation][Feature:User
 						)
 						Expect(err).NotTo(HaveOccurred())
 
+						By("waiting 42s for network settling (test PR - collecting data on RHCOS10+Azure timing)")
+						sleepStart := time.Now()
+						sleepMessage := fmt.Sprintf("TEST PR: sleeping 42s for UDN network settling after pod IP assignment; namespace=%s pod=%s", f.Namespace.Name, udnPod.GetName())
+						framework.Logf("%s", sleepMessage)
+						fmt.Fprintln(os.Stderr, sleepMessage)
+						time.Sleep(42 * time.Second)
+						sleepCompleteMessage := fmt.Sprintf("TEST PR: completed UDN network settling sleep; namespace=%s pod=%s elapsed=%s", f.Namespace.Name, udnPod.GetName(), time.Since(sleepStart).Round(time.Second))
+						framework.Logf("%s", sleepCompleteMessage)
+						fmt.Fprintln(os.Stderr, sleepCompleteMessage)
+
 						for _, destIP := range []string{udnIPv4, udnIPv6} {
 							if destIP == "" {
 								continue