[bc-breaking] rename `config.enable_fsdp_fp8_all_gather` to use `float8`

[vkuzo]

Stack from ghstack (oldest at bottom):

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Summary:

old: enable_fsdp_fp8_all_gather new: enable_fsdp_float8_all_gather

this is to match the float8 naming elsewhere

Test Plan:

./test/test_everything.sh

Reviewers:

Subscribers:

Tasks:

Tags:

Differential Revision: D60252072

[vkuzo]

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This pull request has been merged in pytorch-labs/float8_experimental@eff4ba60570b5e69899860b14688e71e339783dd.