Gate tt.reduce Triton mutation tests on Triton version (#121753)
Summary: The goal is to make the `test_argmax` and `test_reduce_sum` to work both before and after https://github.com/openai/triton/pull/3191 is included into the Triton pin. This is important to make those tests work during the Triton pin update process both in OSS and internally.
Test Plan:
```
$ python test/inductor/test_triton_kernels.py -k test_reduce_sum -k test_argmax
..
----------------------------------------------------------------------
Ran 2 tests in 1.906s
OK
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121753
Approved by: https://github.com/Skylion007
