Summary:
Some tests were failing due to apparent missing include of iomanip. I suspect this was from a gtest upgrade, because in open source, the include iomanip comes from gtest.h. To ensure we maintain compatibility with older gtest as well as the newer one, I pulled the include iomanip out of the in-repo gtest.h. Note that other places in gtest code only instantiate floating-point related templates with `float` and `double` types.
Also, to avoid `make format` being insanely slow on gtest.h, I've excluded third-party from the formatting check.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/13661
Test Plan: make check, internal CI, manually ensure formatting check works outside of third-party/
Reviewed By: jaykorean
Differential Revision: D75963897
Pulled By: pdillinger
fbshipit-source-id: ed5737dd456e74068185f1ac5d57046d7509df7a
eaa4f9d23b