Create test in torchtitan to prevent backward incompatible changes to `torchtitan/experiments/forge` folder

[JenniferWang]

We've seen many backward incompatible changes in the titan repo that causes breakage in torchtitan/experiments/forge.

For example current titan nightly build is broken for forge (caused by pytorch/torchtitan@ff07852)

monarch._src.actor.actor_mesh.ActorError: Actor call TitanTrainer.setup failed.
 Traceback of where the remote call failed (most recent call last):
  File "/home/jiyue/.fbpkg_conda_envs/forge-19456bd/lib/python3.10/site-packages/monarch/_src/actor/actor_mesh.py", line 1167, in handle
    result = await the_method(*args, **kwargs)
  File "/home/jiyue/.fbpkg_conda_envs/forge-19456bd/lib/python3.10/site-packages/forge/actors/trainer/titan.py", line 129, in setup
    self.engine = ForgeEngine(ForgeJobConfig(**engine_config))
  File "/home/jiyue/.fbpkg_conda_envs/forge-19456bd/lib/python3.10/site-packages/torch/distributed/elastic/multiprocessing/errors/__init__.py", line 362, in wrapper
    return f(*args, **kwargs)
  File "/home/jiyue/.fbpkg_conda_envs/forge-19456bd/lib/python3.10/site-packages/torchtitan/experiments/forge/engine.py", line 104, in __init__
    dist_utils.set_determinism(
TypeError: set_determinism() missing 1 required positional argument: 'distinct_seed_mesh_dims'

In order to have a healthy nightly build, we need to add test in titan to capture these changes.

[JenniferWang]

PR for the current breakage pytorch/torchtitan#2121