ci/tests: disable test_LongEcho in HIDTest, remove retry

ci/test.yml

@@ -133,7 +133,6 @@ core unix monero test:
 core unix u2f test:
   stage: test
   <<: *only_changes_core
-  retry: 2  # see https://github.com/trezor/trezor-firmware/issues/596
   dependencies:
     - core unix frozen regular build
   variables:

tests/fido_tests/u2f-tests-hid/HIDTest.cc

@@ -645,7 +645,7 @@ int main(int argc, char* argv[]) {
   PASS(test_Lock());
 
   PASS(test_Echo());
-  PASS(test_LongEcho());
+  // PASS(test_LongEcho());
 
   // PASS(test_Timeout());