ci: Check ISO removal after upgrade

To make sure we can safely remove an old ISO, we do so in upgrade tests,
prior to running the test suite on the upgraded cluster.

eve/main.yml

@@ -2183,6 +2183,19 @@ stages:
             # time to stabilize (e.g.: Rolling update of some DaemonSet that may take
             # some times, especially in multi node context)
             STABILIZATION_TIME: "240"
+      # --- Remove version N-1 ---
+      - ShellCommand:
+          name: Remove previous ISO before running tests
+          command: >
+            ISO_PATH=$(
+            [[%(prop:nodes_count:-0)s -eq 0]] && echo "metalk8s.iso"
+            || echo "/archives/metalk8s.iso") &&
+            ssh -F ssh_config bootstrap "
+            sudo bash
+            /srv/scality/metalk8s-%(prop:metalk8s_version)s/iso-manager.sh
+            --rm-archive \"\$(readlink -f \"${ISO_PATH}\")\" --verbose"
+          workdir: *terraform_workdir
+          haltOnFailure: true
       # --- Test version N ---
       - ShellCommand: *git_pull_ssh
       - ShellCommand: