✨ feat: reconcile pre-existing router

[simonostendorf]

What this PR does / why we need it:

Currently only pre existing networks and subnets are reconciled and not a pre existing router.

I think it is a good idea to also reconcile pre-existing routers and put them in the status. This is useful for debugging, reading info from the status (e.g. outgoing router ip of the cluster) and if the router ip is written to the status, it can be used for the lb allowlist.

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

none

Special notes for your reviewer:

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

TODOs:

• squashed commits
• if necessary:
  • includes documentation
  • adds unit tests

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @simonostendorf. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[EmilienM]

/ok-to-test