feature: Connect the same API on multiple kcp's to the same service cluster

[xrstf]

Feature Description

I have multiple kcp setups, and I now want to connect them all to the same service provider. At the moment the syncagent was written under the asumption that only 1 syncagent handles exactly 1 APIExport/APIGroup.

But I have many kcp's, all offering the same API, that I need to connect to a single service cluster.

Proposed Solution

I could see multiple solutions:

1. A sync-agent could label the resources it has created with its own name. This would allow them to only watch those that they own. This is simple to achieve, but would still require 1 syncagent per kcp.
2. The sync-agent natively supports connecting to many kcps. This would require significant code changes and opens the question how the sync agent would discover new kcp's. Also caching might be a problem, plus it could cause a single-point-of-failure when the sync-agent dies.

Alternative Solutions

No response

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Additional Context

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