Automatic merge from submit-queue (batch tested with PRs 59879, 62729). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Openstack: fix orphaned route deletion
This is a follow-up to #56258 which only got half of the work done.
The OpenStack cloud providers DeleteRoute method fails to delete routes when it can’t find the corresponding instance in OpenStack.
```release-note
OpenStack cloudprovider: Fix deletion of orphaned routes
```
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