fix: align DefaultBatchSize fallback with actual default (50) (#1048)

Two packages defined DefaultBatchSize with different values: resource/resource.go
had 10 while aws/resources/adapter.go had 50. All AWS resources reference the
adapter's 50, making the resource package's 10 a confusing inconsistency.
Align the fallback to 50 so any resource that forgets to set BatchSize gets
the same reasonable default.

Author: james00012

resource/resource.go

@@ -13,7 +13,7 @@ import (
 )
 
 // DefaultBatchSize is the maximum number of resources per batch
-const DefaultBatchSize = 10
+const DefaultBatchSize = 50
 
 // Scope represents the cloud provider-specific scope for a resource.
 // For AWS: Region is set (e.g., "us-east-1" or "global" for global resources)
@@ -49,7 +49,7 @@ type Resource[C any] struct {
 	ResourceTypeName string
 
 	// BatchSize is the maximum number of resources to delete per batch.
-	// If 0, defaults to DefaultBatchSize (10).
+	// If 0, defaults to DefaultBatchSize (50).
 	// Set based on AWS/GCP API rate limits for this resource type.
 	BatchSize int