Make FP8 weights compatible with older MCore version (NVIDIA#2342)

* Make cast_master_weights_to_fp8 compatible with older MCore version

Signed-off-by: kunlunl <kunlunl@nvidia.com>

* Rename keep_columnwise to manual_post_all_gather_processing & Optimize unit test

Signed-off-by: kunlunl <kunlunl@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Remove redundant _test_mini_optimizer()

Signed-off-by: kunlunl <kunlunl@nvidia.com>

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Signed-off-by: kunlunl <kunlunl@nvidia.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Tim Moon <4406448+timmoon10@users.noreply.github.com>

Author: 3 people