PVC auto scale on a per ordinal basis

[agouin]

Main motivation:

• minimize created PVC size and expand only as needed on a per-PVC basis. Previously, it was always creating new PVCs with the latest auto scaled size, which meant that PVCs could not shrink on re-creation without re-creating the entire CosmosFullNode resource.
• Allow autoDataSource to work with snapshots that are node-local

Changes:

• New PVCs will not use the status.selfHealing size, but rather the maximum of: { spec.volumeClaimTemplate.resources.storage, spec.instanceOverrides[instanceName].volumeClaimTemplate.resources.storage, or data source size, if a data source is configured either explicitly or via autoDataSource }
• status.selfHealing is now maintained on a per-instance basis, so that storage expansion is minimized. Pods can have different storage sizes based on their needs.
• Allow autoDataSource to work with snapshots for same instance only with additional matchInstance: true