feature: add support for 0.28 #86
Description
Feature Description
kcp 0.28.x has been released a while ago, we should test and support against it. The main blocker was kcp-dev/kcp#3527, which is now fixed, but since APIExport URLs are no longer populated, there are more changes necessary for 0.28 support.
Proposed Solution
Implement all the missing bits and pieces to run api-syncagent against a kcp 0.28 installation.
Alternative Solutions
No response
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Additional Context
Ideally, we make sure we don't fully drop support for 0.27 and below. So make sure to either switch between v1alpha1 and v1alpha2 APIs as needed (there's been some code additions in the kubectl kcp plugins for this kind of logic) or stay with v1alpha1 APIs for the upcoming release (assuming we don't use any of the new features).