This PR adds nodeAffinity configuration to virtual-machine and
vm-instance charts to support dedicated nodes for Windows VMs.
## Changes
- Added logic to check `cozystack-scheduling` ConfigMap in `cozy-system`
namespace
- If `dedicatedNodesForWindowsVMs` is enabled, adds appropriate
nodeAffinity:
- **Windows VMs**: Strong affinity (required) to nodes with label
`scheduling.cozystack.io/vm-windows=true`
- **Non-Windows VMs**: Soft affinity (preferred) to nodes without the
Windows label
## Implementation
- Windows detection based on `instanceProfile` value starting with
"windows"
- Strong affinity uses `requiredDuringSchedulingIgnoredDuringExecution`
- Soft affinity uses `preferredDuringSchedulingIgnoredDuringExecution`
with weight 100
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added configurable node-affinity for VM scheduling: when the cluster
scheduling flag is enabled, Windows VMs are placed on dedicated Windows
nodes (required rule), while non-Windows VMs are preferred to avoid
those nodes (soft preference).
* Change is gated by the cluster scheduling configuration and only
affects placement rules; no other VM specs were altered.
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settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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