fix(ui,types): Add Metadata form for collection (#11300)

**What**
- Adds missing Metadata form for collections
- Fixes type of metadata in update payload
- Fixes an issue where deleting the last row of a metadata form would prevent adding new ones.

Resolves SUP-784

packages/admin/dashboard/src/routes/collections/collection-metadata/collection-metadata.tsx

@@ -0,0 +1,26 @@
+import { useParams } from "react-router-dom"
+import { MetadataForm } from "../../../components/forms/metadata-form/metadata-form"
+import { useCollection, useUpdateCollection } from "../../../hooks/api"
+
+export const CollectionMetadata = () => {
+  const { id } = useParams()
+
+  const { collection, isPending, isError, error } = useCollection(id!)
+
+  const { mutateAsync, isPending: isMutating } = useUpdateCollection(
+    collection?.id!
+  )
+
+  if (isError) {
+    throw error
+  }
+
+  return (
+    <MetadataForm
+      metadata={collection?.metadata}
+      hook={mutateAsync}
+      isPending={isPending}
+      isMutating={isMutating}
+    />
+  )
+}

packages/admin/dashboard/src/routes/collections/collection-metadata/index.ts

@@ -0,0 +1 @@
+export { CollectionMetadata as Component } from "./collection-metadata"