PowerVS CI: configure public network creation with specific DNS servers

[Amulyam24]

What this PR does / why we need it: It has been observed in CI that the static pod kube-vip creation has been failing intermittently with not being able to pull the image. On further debugging, DNS resolution seemed to not be working with the name servers that were already present on the machine. Pass additional server 1.1.1.1 to the public network creation as it promises to be stable.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

Special notes for your reviewer:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

PowerVS CI: configure public network creation with specific DNS servers

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[Amulyam24]

This PR should be backported to release-0.8 and release-0.7.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Amulyam24, mkumatag

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/blob/main/OWNERS)~~ [mkumatag] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[Amulyam24]

/cherry-pick release-0.8

[k8s-infra-cherrypick-robot]

@Amulyam24: new pull request created: #1866

In response to [this](https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/pull/1863#issuecomment-2202065376): >/cherry-pick release-0.8 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[Amulyam24]

/cherry-pick release-0.7

[k8s-infra-cherrypick-robot]

@Amulyam24: new pull request created: #1867

In response to [this](https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/pull/1863#issuecomment-2202066797): >/cherry-pick release-0.7 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.