Move user defined triton tests to inductor test folder (#120738)
Summary: FBCode CI does not compile torch with CUDA for tests in dynamo folder, instead of adding a special rule, lets move these tests to inductor folder.
Test Plan:
```
buck run mode/opt //caffe2/test/inductor/:triton_kernels
```
now works instead of skipping tests
Differential Revision: D54280629
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120738
Approved by: https://github.com/aakhundov
