[BE][Easy][7/19] enforce style for empty lines in import segments in test/[a-c]*/ and test/[q-z]*/ (#129758)

See https://github.com/pytorch/pytorch/pull/129751#issue-2380881501. Most changes are auto-generated by linter.

You can review these PRs via:

```bash
git diff --ignore-all-space --ignore-blank-lines HEAD~1
```

Pull Request resolved: https://github.com/pytorch/pytorch/pull/129758
Approved by: https://github.com/ezyang

test/cpp/api/init_baseline.py

@@ -4,6 +4,7 @@ import sys
 
 import torch
 
+
 HEADER = """
 #include <torch/types.h>