feat: ability to specify network interface

[sgalsaleh]

What this PR does / why we need it:

Adds the ability to choose the network interface to use for the cluster node(s).

Which issue(s) this PR fixes:

Does this PR require a test?

Does this PR require a release note?

* Adds the ability to choose the network interface to use for the cluster node(s).

Does this PR require documentation?

TBD

[github-actions]

This PR has been released (on staging) and is available for download with a embedded-cluster-smoke-test-staging-app license ID.

Online Installer:

curl "https://staging.replicated.app/embedded/embedded-cluster-smoke-test-staging-app/ci/appver-dev-d0934f5" -H "Authorization: $EC_SMOKE_TEST_LICENSE_ID" -o embedded-cluster-smoke-test-staging-app-ci.tgz

Airgap Installer (may take a few minutes before the airgap bundle is built):

curl "https://staging.replicated.app/embedded/embedded-cluster-smoke-test-staging-app/ci-airgap/appver-dev-d0934f5?airgap=true" -H "Authorization: $EC_SMOKE_TEST_LICENSE_ID" -o embedded-cluster-smoke-test-staging-app-ci.tgz

Happy debugging!

[sgalsaleh]

Bypassing the TestSingleNodeAirgapUpgradeFromEC18 test failure as it's expected to be flakey until the upstream k0s fix is released.