fix(dashboard): Persist variant_rank (#11074)

**What**
- Sends variant_rank to the backend
- Sorts variant table by variant_rank if no other order is selected.

We have a project planned for implementing variant_rank correctly, and adding UI for managing the rank after product creation. This PR handles none of that, as it should be handled as part of said project. This PR simply makes the field useable until then.

Resolves CMRC-859

.changeset/neat-rabbits-teach.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/dashboard": patch
+---
+
+fix(dashboard): Persist variant_rank

packages/admin/dashboard/src/routes/products/product-create/components/product-create-details-form/components/product-create-details-variant-section/product-create-details-variant-section.tsx

@@ -453,6 +453,7 @@ export const ProductCreateVariantsSection = ({
                   >
                     <div>
                       <Checkbox
+                        className="relative"
                         checked={getCheckboxState(watchedVariants)}
                         onCheckedChange={onCheckboxChange}
                       />
@@ -493,6 +494,7 @@ export const ProductCreateVariantsSection = ({
                                   <Form.Item>
                                     <Form.Control>
                                       <Checkbox
+                                        className="relative"
                                         {...field}
                                         checked={value}
                                         onCheckedChange={onChange}

packages/admin/dashboard/src/routes/products/product-create/utils.ts

@@ -58,6 +58,7 @@ export const normalizeVariants = (
     sku: variant.sku || undefined,
     manage_inventory: !!variant.manage_inventory,
     allow_backorder: !!variant.allow_backorder,
+    variant_rank: variant.variant_rank,
     inventory_items: variant
       .inventory!.map((i) => {
         const quantity = i.required_quantity

packages/admin/dashboard/src/routes/products/product-detail/components/product-variant-section/product-variant-section.tsx

@@ -64,7 +64,7 @@ export const ProductVariantSection = ({
     product.id,
     {
       q,
-      order,
+      order: order ? order : "variant_rank",
       offset: offset ? parseInt(offset) : undefined,
       limit: PAGE_SIZE,
       allow_backorder: allow_backorder