fix(medusa): Accept invite should not require first/last name (#5279)

**What**
Makes the first and last name optional when accepting an invite since those column can be nullable

.changeset/seven-snails-live.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/medusa": patch
+---
+
+fix(medusa): Accept invite should not require first/last name

packages/medusa/src/api/routes/admin/invites/accept-invite.ts

@@ -1,4 +1,9 @@
-import { IsNotEmpty, IsString, ValidateNested } from "class-validator"
+import {
+  IsNotEmpty,
+  IsOptional,
+  IsString,
+  ValidateNested,
+} from "class-validator"
 
 import InviteService from "../../../../services/invite"
 import { Type } from "class-transformer"
@@ -92,9 +97,11 @@ export default async (req, res) => {
 
 export class AdminPostInvitesInviteAcceptUserReq {
   @IsString()
+  @IsOptional()
   first_name: string
 
   @IsString()
+  @IsOptional()
   last_name: string
 
   @IsString()