kind-alpha-beta-features: not release informing, serial experiment

The experiment is meant to determine whether running serial tests in the same
job as the parallel tests works and how much slower it becomes.

Even long term the job probably shouldn't be release informing because the
alpha tests can break it at any time, without affecting the release. What needs
to become release informing instead are the kind-alpha-beta-enabled and/or
kind-alpha-beta-enabled-conformance jobs (to be determined after we are done
with setting everything up and they proof to be stable).

Author: pohly

config/jobs/kubernetes/sig-testing/kubernetes-kind-ci.yaml

@@ -153,7 +153,7 @@ periodics:
   cluster: k8s-infra-prow-build
   name: ci-kubernetes-e2e-kind-alpha-beta-features
   annotations:
-    testgrid-dashboards: sig-release-master-informing, sig-testing-kind
+    testgrid-dashboards: sig-testing-kind
     testgrid-tab-name: kind-master-alpha-beta
     description: Runs tests with no special requirements other than alpha or beta feature gates in a KinD cluster where alpha and beta feature gates and APIs are enabled.
     testgrid-alert-email: [email protected],[email protected],[email protected]
@@ -175,7 +175,9 @@ periodics:
       - wrapper.sh
       - bash
       - -c
-      - curl -sSL https://kind.sigs.k8s.io/dl/latest/linux-amd64.tgz | tar xvfz - -C "${PATH%%:*}/" && e2e-k8s.sh
+      # Modified e2e-k8s.sh from https://github.com/kubernetes-sigs/kind/pull/4015/files.
+      # It gets pulled here to try out that modification for a while *before* merging it.
+      - curl -sSL https://kind.sigs.k8s.io/dl/latest/linux-amd64.tgz | tar xvfz - -C "${PATH%%:*}/" && curl -sSLO https://raw.githubusercontent.com/pohly/kind/46d774ce34846c9522efd9de1150b0d3cfa585c8/hack/ci/e2e-k8s.sh && chmod u+x e2e-k8s.sh && ./e2e-k8s.sh
       env:
       - name: FEATURE_GATES
         value: '{"AllAlpha":true,"AllBeta":true,"EventedPLEG": false}'