epic: Root shard de-sharding #4336

Demo Objective

Goal of this epic is decouple root shard as failure point in architecture.

1. Decouple where shard objects are stored feature: Make shards to own shard object locally  #4335
2. Add quotas and limits for shards feature: limits for workspaces on a shard #3472
3. Add heartbeat to the shards so if shards goes offline - we mark them as NotReady so we stop scheduling to it. Like kubelet does with nodes. Ticket - TBD.
4. Add object pruning when shard objects is deleted - ticket TBD
5. Add shard aware scheduling Allow fetching number of logicalclusters on a shard during scheduling #4256
6. Implement identity rotation from KEP-5 https://github.com/kcp-dev/enhancements/blob/c62b9141c1b49df82b0be1d519ec74a11a3a7996/keps/core/0005-apiexport-identity-rotation.md so we can do 7
7. Decouple identities from root shard feature: Identity resolution without root shard #4347

Demo Steps

No response

Action Items

• Scope of the current demo is necessary to fit in the prototype boundaries
• Contribute to the final demo script and recording

Stories

No response