test: Redeploy DNS pods in AfterAll for datapath tests

Commit a0e7712 ("test: Redeploy DNS after changing endpointRoutes")
didn't go quite far enough: It ensured that between individual tests in
a given file, the DNS pods would be redeployed during the next run if
there were significant enough datapath changes. However, the way it did
this was by storing state within the 'kubectl' variable, which is
recreated in each test file. So if the last test in one CI run enabled
endpoint routes mode, then the DNS pods would not be redeployed to
disable endpoint routes mode as part of the next test.

Fix it by redeploying DNS after removing Cilium from the cluster.
Kubernetes will remove the current DNS pods and reschedule them, but
they will not launch until the next test deploys a new version of
Cilium.

Reported-by: Chris Tarazi <chris@isovalent.com>
Fixes: 0e77127dcd7 ("test: Redeploy DNS after changing endpointRoutes")
Related: #16717

Signed-off-by: Joe Stringer <joe@cilium.io>

test/k8sT/CustomCalls.go

@@ -113,6 +113,7 @@ var _ = Describe("K8sCustomCalls", func() {
 		AfterAll(func() {
 			deploymentManager.DeleteCilium()
 			deploymentManager.DeleteAll()
+			kubectl.RedeployDNS()
 		})
 
 		installPods := func() {

test/k8sT/DatapathConfiguration.go

@@ -55,6 +55,7 @@ var _ = Describe("K8sDatapathConfig", func() {
 
 	AfterAll(func() {
 		deploymentManager.DeleteCilium()
+		kubectl.RedeployDNS()
 		kubectl.CloseSSHClient()
 	})