fix(richtext-lexical): inline blocks did not store nested fields correctly (#10578)

Fixes https://github.com/payloadcms/payload/issues/10555

Form state with nested fields was not unflattened before saving field
data to the node

test/fields/payload-types.ts

@@ -3374,6 +3374,21 @@ export interface LexicalBlocksRadioButtonsBlock {
   blockName?: string | null;
   blockType: 'radioButtons';
 }
+/**
+ * This interface was referenced by `Config`'s JSON-Schema
+ * via the `definition` "AvatarGroupBlock".
+ */
+export interface AvatarGroupBlock {
+  avatars?:
+    | {
+        image?: (string | null) | Upload;
+        id?: string | null;
+      }[]
+    | null;
+  id?: string | null;
+  blockName?: string | null;
+  blockType: 'AvatarGroup';
+}
 /**
  * This interface was referenced by `Config`'s JSON-Schema
  * via the `definition` "auth".