Investigate failing test test_profiler_experimental_tree_with_stack_and_modules

In the CPU-only builds, we get a pytorch/test failure:
```
FAILED [0.0142s] test/profiler/test_profiler_tree.py::TestProfilerTree::test_profiler_experimental_tree_with_stack_and_modules - AssertionError: String comparison failed: '    [939 chars]     torch/profil...
```
We've disabled it in CI. This issue is to track investigating what the problem is.