Run more C++ tests on CI (#333)

Summary:
This runs C++ tests on both Linux and MacOS CI. Also there are several fixes here to make the test works on Linux:

* In aten mode with libtorch, gtest needs to be compiled with `-D_GLIBCXX_USE_CXX11_ABI=0`, same as libtorch to avoid linker error.
* `libgomp-a34b3233.so.1` is missing in Linux, it's required by libtorch in the same mode above.
* When compiling with pthread, gtest is crashing at teardown with the error `googletest/include/gtest/internal/gtest-port.h:1771:: pthread_key_delete(key_)failed with error 22`, so I turn this off for now.  The test is pretty fast.
* One of the platform test `platform_override_test` refuses to pass on Linux.  I'm skipping it there for now to unblock this change.  Here is the error P827107972

Pull Request resolved: https://github.com/pytorch/executorch/pull/333

Test Plan: https://github.com/pytorch/executorch/actions/runs/6182116076/job/16781279705?pr=333

Reviewed By: guangy10

Differential Revision: D49264959

Pulled By: huydhn

fbshipit-source-id: 772cd77142acb767089cb9e3cd7386f28dd3c1c0