BC-6292 using wget as the k8s http probes were not failing (#3390)

hopefully this is a workaround for a problem that we can not fully
identifiy
we can only pin point it to the k8s probe itself, if it is the k8s
version, the affected version would be v1.26.11

ansible/roles/schulcloud-client-core/templates/deployment.yml.j2

@@ -59,26 +59,23 @@ spec:
         - mountPath: /home/node/app/config/http-headers.js
           subPath: http-headers.js
           name: http-headers
+        # /login was chosen because on THR, the / redirects to TSP
         readinessProbe:
-          httpGet:
-            # /login was chosen because on THR, the / redirects to TSP
-            path: /login
-            port: 3100
-          timeoutSeconds: 4
+          exec:
+            command: ["wget", "--timeout", "4", "-O", "/dev/null", "http://localhost:3100/login"]
+          timeoutSeconds: 5
           failureThreshold: 3
           periodSeconds: 10
         livenessProbe:
-          httpGet:
-            path: /login
-            port: 3100
-          timeoutSeconds: 4
+          exec:
+            command: ["wget", "--timeout", "4", "-O", "/dev/null", "http://localhost:3100/login"]
+          timeoutSeconds: 5
           failureThreshold: 3
           periodSeconds: 15
         startupProbe:
-          httpGet:
-            path: /login
-            port: 3100
-          timeoutSeconds: 4
+          exec:
+            command: ["wget", "--timeout", "4", "-O", "/dev/null", "http://localhost:3100/login"]
+          timeoutSeconds: 5
           failureThreshold: 36
           periodSeconds: 5
         resources: