[Inductor][fx pass] Add split cat pattern to remove cat nodes (#115004)
Summary: Titled
Test Plan:
# unit test
```
buck2 test 'fbcode//mode/dev-nosan' fbcode//caffe2/test/inductor:split_cat_fx_passes
```
Buck UI: https://www.internalfb.com/buck2/8e4179db-363a-41b5-8bd7-cc445a512f6f
Test UI: https://www.internalfb.com/intern/testinfra/testrun/15762598708548039
Network: Up: 91KiB Down: 32KiB (reSessionID-b0985d82-1919-49c5-b307-ee0ab49b4738)
Jobs completed: 28. Time elapsed: 1:27.1s.
Cache hits: 0%. Commands: 2 (cached: 0, remote: 0, local: 2)
Tests finished: Pass 11. Fail 0. Fatal 0. Skip 0. Build failure 0
# local reproduce (IG_CTR)
```
buck2 run mode/opt //scripts/jackiexu0313/pt2:local_model_with_pt2 -- --test_mode split_batch
```
P895047189
Differential Revision: D51777617
Pull Request resolved: https://github.com/pytorch/pytorch/pull/115004
Approved by: https://github.com/jackiexu1992
