[test][fix] add retry logic for flaky e2e test

Replace fixed 5s sleep in UDP Stickiness test with retry loop that checks stickiness update up to 12 times with 10s intervals, exiting early on success or timing out with error message

Author: komer3

e2e/test/lb-with-udp-ports-stickiness/chainsaw-test.yaml

@@ -47,12 +47,28 @@ spec:
               echo "Nodebalancer config found, updating config stickiness"
 
               kubectl annotate --overwrite svc svc-test -n $NAMESPACE service.beta.kubernetes.io/linode-loadbalancer-default-stickiness=source_ip
-              sleep 5s
-
-              echo "Verifying that stickiness is set to source_ip"
-              nbconfig=$(LINODE_TOKEN=$LINODE_TOKEN NBID=$nbid ../scripts/get-nb-config.sh)
-              stickiness=$(echo $nbconfig | jq -r '.stickiness')
-              echo "stickiness is $stickiness"
+              
+              echo "Waiting for stickiness to be updated to source_ip..."
+              max_attempts=12
+              for i in $(seq 1 $max_attempts); do
+                echo "Attempt $i/$max_attempts: Checking stickiness..."
+                nbconfig=$(LINODE_TOKEN=$LINODE_TOKEN NBID=$nbid ../scripts/get-nb-config.sh)
+                stickiness=$(echo $nbconfig | jq -r '.stickiness')
+                echo "Current stickiness: $stickiness"
+                
+                if [[ "$stickiness" == "source_ip" ]]; then
+                  echo "Stickiness successfully updated to source_ip"
+                  break
+                fi
+                
+                if [[ $i -eq $max_attempts ]]; then
+                  echo "Timeout: Stickiness was not updated to source_ip after $max_attempts attempts"
+                  exit 1
+                fi
+                
+                echo "Waiting 10 seconds before next check..."
+                sleep 10
+              done
             check:
               ($error == null): true
-              (contains($stdout, 'stickiness is source_ip')): true
+              (contains($stdout, 'Stickiness successfully updated to source_ip')): true