Googletest export

• Fix a bug in dealing with paramaterized tests where the name is it self a macro expansion.
• Add a compile time check to ensure that the parameters to TEST_P and INSTANTIATE_TEST_SUITE_P are not empty. The above fix causes some compilers to fail in that case and even where it works, it's likely to result in technically invalid code by virtue of creating reserved identifiers:

https://en.cppreference.com/w/cpp/language/identifiers

PiperOrigin-RevId: 274047249