Fix type errors

cypress/support/index.ts

@@ -34,7 +34,6 @@ Cypress.Commands.add("logIn", (user: MockUser) => {
       id: ADMIN_UUID,
       discordId: ADMIN_TEST_DISCORD_ID,
       discordAvatar: ADMIN_TEST_AVATAR,
-      discordName: "Sendou",
     },
   } as const;
 

server/mock-auth.ts

@@ -48,7 +48,6 @@ export function setUpMockAuth(
         discordAvatar: newMockUser.discordAvatar,
         discordId: newMockUser.discordId,
         id: newMockUser.id,
-        discordName: newMockUser.discordName,
       };
     } catch {
       return res.status(400).end();