[vmap][dynamo] run vmap under python dispatcher (#107947)
Before `test_op_has_batch_rule_cholesky_solve_cpu_float32` failed:
```
PYTORCH_TEST_WITH_DYNAMO=1 pytest test/functorch/test_vmap.py -k test_op_has_batch_rule_cholesky_solve_cpu_float32
test/functorch/test_vmap.py terminate called after throwing an instance of 'pybind11::error_already_set'
what(): RuntimeError: /home/kshiteej/Pytorch/pytorch_functorch/build/aten/src/ATen/RegisterCompositeExplicitAutograd.cpp:2214: SymIntArrayRef expected to contain only concrete integers
```
After this PR the test cases
NOTE: We can't be 100% of tests on CI till we figure out https://github.com/pytorch/pytorch/issues/107444
Pull Request resolved: https://github.com/pytorch/pytorch/pull/107947
Approved by: https://github.com/zou3519
