[FSDP] compile compute and CI with @test_compiled_fsdp (#119933)
goal: all unit tests for eager. we want to test torch.compile by default
this PR adds ``@test_compiled_fsdp(compile_compute_on_module=None/TransformerBlock)`` to unit tests. now it's compiling compute-only as follows.
```
module.compile() # include user registered hooks if any
fully_shard(module)
```
torch.compile does not work following component yet
* compiling AC
* compiling reshard_after_forward=2
* delayed_all_gather, delayed_reduce_scatter
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119933
Approved by: https://github.com/awgu, https://github.com/jansel
