[MM-61259] Fix errcheck issues in server/channels/app/import_utils_test.go (#28955)

server/channels/app/import_utils_test.go

@@ -35,7 +35,10 @@ func TestGeneratePassword(t *testing.T) {
 
 	t.Run("Should not fail on concurrent calls", func(t *testing.T) {
 		for i := 0; i < 10; i++ {
-			go generatePassword(10)
+			go func() {
+				_, err := generatePassword(10)
+				require.NoError(t, err)
+			}()
 		}
 	})
 }