node-controller: support multi-nic

[hown3d]

How to categorize this PR?

/kind enhancement

What this PR does / why we need it:
Nodes with multiple NICs attached report in a non-deterministic way which IP to use as the primary one since the NICs of a server are returned in non-deterministic order from the Iaas API.

This PR ensures to always sort the returned NICs as well as having the option to specify a defaultNetwork, which when set, reports the NIC of the network on index 0.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Breaking changes:

[ske-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[hammadzf]

Review done together with @crigertg and @aniruddha2000

Minor suggestions and clarifying questions here and there, otherwise the approach looks good to us.

[ske-prow]

@hown3d: 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
pull-cloud-provider-stackit-verify	be44443	link	true	/test pull-cloud-provider-stackit-verify

Full PR test history. Your PR dashboard. Command help for this repository.
Please help us cut down on flakes by linking this test failure to an open flake report or filing a new flake report if you can't find an existing one. Also see the gardener testing guideline for how to avoid and hunt flakes.

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[hammadzf]

/lgtm

[ske-prow]

@hammadzf: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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In response to this:

/lgtm

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[nschad]

needs a quick make fmt. sorry @hown3d my comment has some extra spaces