Give each mypy prek hook its own file list in CI

[FrankYang0529]

Why

• prek runs hooks from different prek projects concurrently. Every one of them wrote its mypy file list to the same files/mypy_files.txt.
• On v3-3-test run 30279407098, mypy-shared-configuration, mypy-shared-dagnode and mypy-shared-listeners all failed on non-existent path.

Their writing file time are close.

2026-07-27T17:28:58.9980347Z     Running mypy for folders: ['shared/configuration']
2026-07-27T17:28:58.9981475Z     You can check the list of files in: /home/runner/work/airflow/airflow/files/mypy_files.txt

2026-07-27T17:28:59.0832479Z     Running mypy for folders: ['shared/dagnode']
2026-07-27T17:28:59.0833606Z     You can check the list of files in: /home/runner/work/airflow/airflow/files/mypy_files.txt

2026-07-27T17:28:59.1323493Z     Running mypy for folders: ['shared/listeners']
2026-07-27T17:28:59.1324120Z     You can check the list of files in: /home/runner/work/airflow/airflow/files/mypy_files.txt

2026-07-27T17:28:59.0455195Z     mypy: Cannot read file 'shared/dagnode/tests/dagnode/__init__.pyteners/spec/taskinstance.py': No such file or directory

2026-07-27T17:28:59.1199107Z     mypy: Cannot read file 'shared/dagnode/tests/dagnode/__init__.pyteners/spec/taskinstance.py': No such file or directory

2026-07-27T17:28:59.1521972Z     mypy: Cannot read file 'shared/dagnode/tests/dagnode/__init__.pyteners/spec/taskinstance.py': No such file or directory

How

• run_mypy_full_dist_local_venv_or_breeze_in_ci.py: Use suffix argument in write_file_list() to avoid overwriting same file.

---

Was generative AI tooling used to co-author this PR?

• Yes - Claude Code

---

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[potiuk]

Good idea - I think prek only fairly recently started to run checks in parallel but that one seems like it wll solve that issue.