[fbgemm_gpu] Add GenAI-only variant release workflow

[q10]

• Add GenAI-only variant release workflow

• Add artifact publish to ROCm nightlies

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@q10 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@q10 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@q10 merged this pull request in pytorch/FBGEMM@3070f88d0dce506f2cba7f2019ea8dfc491e5c3b.