feat: add autoflake to .pre-commit-config.yaml files

[anscfrisson]

This will save us time fixing issues raised by flake.

[anscfrisson]

@ansys/solution-maintainers

I would appreciate your insight on the failing check: basic_solution_validation — End-to-end tests with SAF Solution.

style: commands[1]> pre-commit run --all-files --show-diff-on-failure
An error has occurred: InvalidConfigError: 
==> File .pre-commit-config.yaml
==> At Config()
==> At key: repos
==> At Repository(repo='https://github.com/PyCQA/autoflake')
==> At key: hooks
==> At Hook(id=MISSING)
=====> Missing required key: id
Check the log at /home/runner/.cache/pre-commit/pre-commit.log

Notes:

• I can not access ansys-internal/solution-applications-actions/check-code-style@v12 from presumably https://github.com/ansys-internal/solution-applications-actions to get further insight on check-code-style@v12
• pre-commit run --all-files --show-diff-on-failure succeeds on my machine (Windows 11, Python 3.10.11)
• the supposedly missing id is present in .pre-commit-config.yaml:

  - repo: https://github.com/PyCQA/autoflake
    rev: v2.3.1
    hooks:
    - id: autoflake
      args: [
        "--expand-star-imports",
        "--ignore-pass-statements",
        "--in-place",
        "--remove-all-unused-imports",
        "--remove-unused-variables",
      ]