[BE][Easy][1/19] enforce style for empty lines in import segments (#129752)

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/129752
Approved by: https://github.com/ezyang, https://github.com/malfet

scripts/analysis/format_test_csv.py

@@ -20,6 +20,7 @@ import csv
 import subprocess
 import sys
 
+
 parser = argparse.ArgumentParser(
     description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter
 )