compute: retrieving the Resource SKUs for the current location only

This fixes an issue where we're unintentionally loading information about all SKUs in all Locations rather
than filtering to the specific location - which has become progressively larger.

This reduces the memory footprint passing through this function down by 10x

internal/services/compute/no_downtime_resize.go

@@ -6,6 +6,7 @@ package compute
 import (
 	"context"
 	"fmt"
+	"github.com/hashicorp/go-azure-helpers/resourcemanager/location"
 	"log"
 	"strings"
 
@@ -81,16 +82,24 @@ func determineIfVirtualMachineSkuSupportsNoDowntimeResize(ctx context.Context, v
 		return nil, fmt.Errorf("retrieving %s: %+v", *virtualMachineId, err)
 	}
 
+	vmLocation := ""
 	vmSku := ""
-	if model := virtualMachine.Model; model != nil && model.Properties != nil && model.Properties.HardwareProfile != nil && model.Properties.HardwareProfile.VMSize != nil {
-		vmSku = string(*model.Properties.HardwareProfile.VMSize)
+	if model := virtualMachine.Model; model != nil {
+		vmLocation = location.Normalize(model.Location)
+		if model.Properties != nil && model.Properties.HardwareProfile != nil && model.Properties.HardwareProfile.VMSize != nil {
+			vmSku = string(*model.Properties.HardwareProfile.VMSize)
+		}
 	}
-	if vmSku == "" {
+	if vmLocation == "" || vmSku == "" {
 		return pointer.To(false), nil
 	}
 
 	subscriptionId := commonids.NewSubscriptionID(virtualMachineId.SubscriptionId)
-	skusResponse, err := skusClient.ResourceSkusListComplete(ctx, subscriptionId, skus.DefaultResourceSkusListOperationOptions())
+	opts := skus.DefaultResourceSkusListOperationOptions()
+	// @tombuildsstuff: by default this API returns EVERY SKU in EVERY LOCATION meaning this will get
+	// progressively larger each time - instead we filter to the current Location only.
+	opts.Filter = pointer.To(fmt.Sprintf("location eq '%s'", vmLocation))
+	skusResponse, err := skusClient.ResourceSkusListComplete(ctx, subscriptionId, opts)
 	if err != nil {
 		return nil, fmt.Errorf("retrieving information about the Resource SKUs to check if the Virtual Machine/Disk combination supports no-downtime-resizing: %+v", err)
 	}