Revert "Unify TEST_CUDNN definition (#105594)"
This reverts commit 1ea153a11d3011b90cdac1f9977889988a0c981f.
Reverted https://github.com/pytorch/pytorch/pull/105594 on behalf of https://github.com/PaliC due to breaks periodic test `distributed/_tensor/test_dtensor.py::TestDynamoDTensor::test_dynamo_dtensor` ([comment](https://github.com/pytorch/pytorch/pull/105594#issuecomment-1644166414))
