`{gmock_stress_test,googletest-listener-test} --gtest_list_tests` assumes the tests are executed, instead of just listing the available tests

Long story short, using `--gtest_list_tests` should only list the available tests, not execute the tests:
```
$ /usr/tests/lib/googletest/gmock/gmock_stress_test --gtest_list_tests
StressTest.
CanUseGMockWithThreads

[ FATAL ] /usr/src/contrib/googletest/googlemock/test/gmock_stress_test.cc:317:: Condition exit_code != 0 failed. RUN_ALL_TESTS() did not fail as expected

Abort trap (core dumped)
```

This issue is similar to #453, which seems to have been fixed by "adding actual tests" in bad778caa.

Reproduce the behavior with gmock_stress_test and inspect googlemock/test/gmock_stress_test.cc around line 317, then compare how --gtest_list_tests is handled by the listener-related test. Done means both gmock_stress_test and googletest-listener-test only list available tests with this option, without running tests, printing the fatal failure, or aborting.

Written by the indexing model from the issue text.