Added the updown-ibmcloud.sh script path to the IBM Cloud presubmit jobs

[varshadeshmane92]

• Updated the IBM Cloud presubmit job to call the updown-ibmcloud.sh script
  instead of using inline commands.
• This change automates the end-to-end (E2E) testing for IBM Cloud PowerVS
  while making the job definition cleaner and easier to maintain.

[k8s-ci-robot]

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[Rajalakshmi-Girish]

@varshadeshmane92 recently there were changes to the kubetest2 TF deployer setup commands via kubernetes-sigs/provider-ibmcloud-test-infra#91

With this update, running make install-deployer-tf installs prebuilt binaries from IBM COS. However, the purpose of the pull-provider-ibmcloud-test-infra-kubernetes job is to validate the changes introduced in provider-ibmcloud-test-infra repo.

To ensure this, the job should build the binaries dynamically during execution and then use them for cluster testing.

Could you please update the updown-ibmcloud.sh script accordingly, following the approach in the PR: #36853
Do run a test-pj before requesting review here.

@kishen-v

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: varshadeshmane92
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