istio: Remove Multus settings from the default Istio config

[ormergi]

What this PR does / why we need it:
Following recent Istio bump a regression has been introduced in CDI+Istio lane
https://prow.ci.kubevirt.io/view/gs/kubevirt-prow/pr-logs/pull/kubevirt_containerized-data-importer/3694/pull-containerized-data-importer-e2e-istio/1909911853820022784

The default Istio config 'istio-operator.cr.yaml' is intended to be used when Multus is not installed in the cluster.
Multus depends on the NetworkAttachmentDefinition CRD to be installed.

Currently the default Istio config is invalid, because it specify setting that installs the istio-cni NetworkAttachmentDefinition CR, where it should be used when no Multus is installed. For setups that have Multus installed, the 'istio-operator-with-cnao.cr.yaml' config should be used.

Remove Multus related settings from the default Istio config.

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:

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Release note:

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request removes Multus-related configurations from the default Istio operator configuration file (istio-operator.cr.yaml). This change addresses a regression introduced after an Istio update, where the default Istio config was incorrectly including settings for Multus, making it invalid when Multus is not installed. By removing these settings, the default config is now suitable for environments without Multus.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Removed Multus-specific settings from the default Istio configuration.	Removed the provider: multus setting under spec.cni.	cluster-provision/gocli/opts/istio/manifests/istio-operator.cr.yaml

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[kubevirt-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign stu-gott for approval. For more information see the Code Review Process.

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[sourcery-ai]

Hey @ormergi - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a comment in the file itself explaining why the provider: multus setting was removed.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[ormergi]

/cc @akalenyu @nirdothan

[ormergi]

@akalenyu could you please verify this PR changes fixes the issue on CDI+Istio lane?

[kubevirt-bot]

@ormergi: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
check-provision-k8s-1.31-s390x	55c1860	link	false	/test check-provision-k8s-1.31-s390x

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