hash_test.cc leans heavily on INSTANTIATE_TYPED_TEST_SUITE_P, which is
quite memory- and CPU-hungry. Split a few heavyweight tests into a new
hash_instantiated_test.cc, reducing peak RAM consumption (or, on
multicore systems, compilation time).

PiperOrigin-RevId: 535305679
Change-Id: Ic204da0a47c749c3f7db5f902ade8d74ed3043bb