Replace flake8 with ruff

[kimwnasptd]

Context

While working on a new charm canonical/github-profiles-automator#7 I realised that charmcraft init now is using ruff by default for lint and not flake8 canonical/charmcraft#1461

As of 27 November 2024 the auto-created configuration for ruff in pyproject.toml is the following

# Linting tools configuration
[tool.ruff]
line-length = 99
lint.select = ["E", "W", "F", "C", "N", "D", "I001"]
lint.extend-ignore = [
    "D203",
    "D204",
    "D213",
    "D215",
    "D400",
    "D404",
    "D406",
    "D407",
    "D408",
    "D409",
    "D413",
]
lint.ignore = ["D107"]
extend-exclude = ["__pycache__", "*.egg_info"]
lint.per-file-ignores = {"tests/*" = ["D100","D101","D102","D103","D104"]}

[tool.ruff.lint.mccabe]
max-complexity = 10

We should gradually replace flake8 in all our charms. Looking a bit around other teams have done this as well:

• feat: add juju storage support for log.dirs kafka-k8s-operator#27
• use ruff instead of flake8 grafana-k8s-operator#214
• chore: replace black with ruff as the formatter kratos-operator#190

What needs to get done

1. Replace the [tool.flake8] with [tool.ruff], if a repo contains a pyproject.yaml file
2. Update the unit environment of tox to use ruff instead of flake8
3. Update the corresponding .in file (or pyproject.yaml in case of poetry) to install ruff
4. Run ruff check and fix all the incompatibilities

Definition of Done

When all of the Analytics charms are using ruff

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-6597.

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