Convert GPUConfig.GPUMemGiB from int to resource.Quantity

[Copilot]

Refactors GPUConfig struct to use Kubernetes resource.Quantity for GPU memory instead of raw integers, providing better type safety and alignment with K8s resource management patterns.

Changes

• Core struct update: Changed GPUMemGiB field type from int to resource.Quantity
• Helper function: Added NewGPUMemGiB(gib int64) to construct Quantity values in bytes from GiB integers
• SKU definitions: Updated all GPU configurations across Azure (30), AWS (59), and Arc (10) providers to use NewGPUMemGiB()
• Validation logic: Updated GPU memory comparisons to use .Cmp() method and .Value() for byte-level calculations
• Estimators: Modified memory calculations in basic and advanced node estimators to work with Quantity values
• Utilities: Updated GetGPUConfigFromNodeLabels() to convert MiB node labels to Quantity in bytes
• Tests: Updated all test cases to use new type and comparison methods

Example

// Before
gpuConfig := &sku.GPUConfig{
    GPUMemGiB: 80,  // Plain integer
}

// After  
gpuConfig := &sku.GPUConfig{
    GPUMemGiB: sku.NewGPUMemGiB(80),  // resource.Quantity in bytes
}

// Comparisons now use Quantity methods
if gpuConfig.GPUMemGiB.Cmp(otherConfig.GPUMemGiB) != 0 {
    // Handle difference
}

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Convert GPUMemory type from int to resource.Quantity</issue_title>
<issue_description>Can be a follow-up but it's probably better to refactor GPUConfig struct to use resource.Quantity instead of int for GPU memory

Originally posted by @chewong in #1536 (comment)
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Convert GPUMemory type from int to resource.Quantity #1590

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.