Remove cluster-api release-1.8 jobs

Signed-off-by: Muhammad Adil Ghaffar <[email protected]>

Author: adilGhaffarDev

config/jobs/kubernetes-sigs/cluster-api/cluster-api-prowjob-gen.yaml

@@ -107,25 +107,6 @@ prow_ignored:
           to: "1.31"
         - from: "1.31"
           to: "1.32"
-    release-1.8:
-      testImage: "gcr.io/k8s-staging-test-infra/kubekins-e2e:v20250714-70266d743a-1.30"
-      interval: "4h"
-      upgradesInterval: "24h"
-      kubernetesVersionManagement: "v1.27.13"
-      kubebuilderEnvtestKubernetesVersion: "1.27.1"
-      upgrades:
-        - from: "1.25"
-          to: "1.26"
-        - from: "1.26"
-          to: "1.27"
-        - from: "1.27"
-          to: "1.28"
-        - from: "1.28"
-          to: "1.29"
-        - from: "1.29"
-          to: "1.30"
-        - from: "1.30"
-          to: "1.31"
 
   # The generator will run each template per branch and use a filename friendly
   # branch variable to format the target filename.