E2e tests are failing

[mkumatag]

/kind bug
/area provider/ibmcloud

What steps did you take and what happened:
prow e2e tests failing with following error

Docker in Docker enabled, initializing...
================================================================================
Starting Docker: docker.
Waiting for docker to be ready, sleeping for 1 seconds.
================================================================================
Done setting up docker in docker.
+ WRAPPED_COMMAND_PID=156
+ ./scripts/ci-e2e.sh
+ wait 156
error: unknown flag: --short
See 'kubectl version --help' for usage.
./scripts/../hack/ensure-kubectl.sh: line 44: kubectl_version[2]: unbound variable
./scripts/../hack/ensure-kubectl.sh: line 45: kubectl_version[2]: unbound variable
+ EXIT_VALUE=1
+ set +o xtrace
Cleaning up after docker in docker.
================================================================================
Cleaning up after docker
Stopping Docker: dockerProgram process in pidfile '/var/run/docker-ssd.pid', 1 process(es), refused to die.
================================================================================
Done cleaning up after docker in docker.

e.g: https://prow.ppc64le-cloud.cis.ibm.net/view/gs/ppc64le-kubernetes/logs/periodic-capi-provider-ibmcloud-e2e-powervs/1735766765889130496

What did you expect to happen:

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• Cluster-api version:
• Minikube/KIND version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

[mkumatag]

Because of this change ppc64le-cloud/test-infra#435 now e2e tests in the prow using the latest kubectl(1.28) which removed this deprecate flag, hence we need to remove this flag from the script as well.

[mkumatag]

deprecation message with the older release:

% kubectl version --client
WARNING: This version information is deprecated and will be replaced with the output from kubectl version --short.  Use --output=yaml|json to get the full version.
Client Version: version.Info{Major:"1", Minor:"27", GitVersion:"v1.27.2", GitCommit:"7f6f68fdabc4df88cfea2dcf9a19b2b830f1e647", GitTreeState:"clean", BuildDate:"2023-05-17T14:20:07Z", GoVersion:"go1.20.4", Compiler:"gc", Platform:"darwin/arm64"}
Kustomize Version: v5.0.1

with 1.28 onwards:

% kubectl version --client --short
error: unknown flag: --short
See 'kubectl version --help' for usage.
(base)