style: ignore jest/no-test-callback in non-jest tests

test/admin.test.js

@@ -15,6 +15,7 @@ fixture('Admin user')
     admin = result.userData
   })
 
+// eslint-disable-next-line jest/no-test-callback
 test('Password reset journey', async t => {
   // start mail server
   mailHelper.start()

test/guest.test.js

@@ -8,6 +8,7 @@ fixture('Guest user')
     await setup()
   })
 
+// eslint-disable-next-line jest/no-test-callback
 test('Signup journey', async t => {
   const user = {
     username: faker.internet.domainWord(),