Make SharedDRAManager a part of the ClusterSnapshotStore interface, and
implement dummy methods to satisfy the interface. Actual implementation
will come in later commits.
This is needed so that ClusterSnapshot can feed DRA objects to the DRA
scheduler plugin, and obtain ResourceClaim modifications back from it.
The integration is behind the DRA flag guard, this should be a no-op
if the flag is disabled.
simulator.BuildNodeInfoForNode, core_utils.GetNodeInfoFromTemplate,
and scheduler_utils.DeepCopyTemplateNode all had very similar logic
for sanitizing and copying NodeInfos. They're all consolidated to
one file in simulator, sharing common logic.
DeepCopyNodeInfo is changed to be a framework.NodeInfo method.
MixedTemplateNodeInfoProvider now correctly uses ClusterSnapshot to
correlate Nodes to scheduled pods, instead of using a live Pod lister.
This means that the snapshot now has to be properly initialized in a
bunch of tests.
Methods to interact with the new internal types are added to
ClusterSnapshot. Cluster Autoscaler code will be migrated to only
use these methods and work on the internal types instead of directly
using the framework types.
The new types are designed so that they can be used as close to the
framework types as possible, which should make the migration manageable.
This allows easily adding additional data to the Nodes and Pods tracked
in ClusterSnapshot, without having to change the scheduler framework.
This will be needed to support DRA, as we'll need to track
ResourceSlices and ResourceClaims.
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