* [test] smaller gpt2 test case
* [test] reduce test cases: tests/test_zero/test_gemini/test_zeroddp_state_dict.py
* [test] reduce test cases: tests/test_zero/test_gemini/test_grad_accum.py
* [test] reduce test cases tests/test_zero/test_gemini/test_optim.py
* Revert "[test] smaller gpt2 test case"
Some tests might depend on the size of model (num of chunks)
This reverts commit df705a5210.
* [test] reduce test cases: tests/test_checkpoint_io/test_gemini_checkpoint_io.py
* [CI] smaller test model for two mwo the two modifid cases
* [CI] hardcode gpt model for tests/test_zero/test_gemini/test_search.py since we need a fixed answer there