skip fsdp2 low bit optim test in nightlies

[msaroufim]

Temporary workaround for #652

I didn't debug this but seems like it's some dynamic shape issue - cc @ezyang @gau-nernst

[pytorch-bot]

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[gau-nernst]

The FSDP test only run in nightly, so if we skip, it won't run at all. Will try if I can debug it today.
Also, are you looking at adding 2.4 to CI?

[gau-nernst]

If this test succeeds in 2.4 (observing #654), I will approve this. Otherwise, will try if I can fix it today. This is also affecting my #644, probably because I also use optimizer from low_bit_optim for the quantized training FSDP test.