Chore/update linting tools

[mcocdawc]

Description

Updated and unified the pre-commit hooks in all earthkit packages.
Some of them were failing the test suite just because of the pre-commit hooks.
Fixing this it was a good opportunity to unify settings.

Uses now ruff for formatting (former black), linting, and import sort (former isort)

The following PRs do the same changes in all the earthkit packages:

• Chore/update linting tools earthkit-climate#43
• Chore/update linting tools earthkit-data#927
• Chore/update linting tools earthkit-geo#39
• Chore/update linting tools earthkit-hydro#178
• Chore/update linting tools earthkit-meteo#125
• Chore/update linting tools earthkit-plots#176
• Chore/update linting tools earthkit-time#14
• Chore/update linting tools #87
• Chore/update linting tools earthkit-workflows#173

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[Copilot]

Pull request overview

Updates and standardizes linting/formatting across the repository by moving to ruff for formatting, linting, and import sorting, and aligning the pre-commit configuration so code quality checks don’t spuriously fail CI.

Changes:

• Switch/align pre-commit hooks to run ruff for linting (ruff-check) and formatting (ruff-format).
• Update Ruff configuration in pyproject.toml (line length and lint rule selection/ignores).
• Apply automated formatting changes across tests, library modules, and documentation notebooks.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.pre-commit-config.yaml	Updates pre-commit to use Ruff hooks and configured arguments.
pyproject.toml	Centralizes Ruff configuration (line length, lint selects/ignores).
src/earthkit/transforms/temporal/_rates.py	Formatting-only changes to attribute/history string construction.
src/earthkit/transforms/temporal/_aggregate.py	Formatting-only changes to list comprehensions/array creation.
src/earthkit/transforms/spatial/_aggregate.py	Formatting-only changes to return call and list comprehension layout.
src/earthkit/transforms/climatology/_aggregate.py	Formatting-only changes to relative anomaly expression and return call.
src/earthkit/transforms/_tools.py	Formatting-only changes to raised error strings and list comprehension layout.
tests/test_30_temporal_rates.py	Formatting-only changes to calls/expressions for Ruff formatting compliance.
tests/test_30_temporal_aggregate.py	Formatting-only changes to an all(...) assertion.
tests/test_30_spatial.py	Formatting-only changes to DataArray creation and function calls.
tests/test_20_aggregate.py	Formatting-only changes to a helper call.
tests/test_10_tools.py	Formatting-only changes to DataArray/Dataset literals and calls.
tests/legacy-api/test_legacy_30_temporal.py	Mirrors formatting changes in legacy API tests.
tests/legacy-api/test_legacy_10_tools.py	Mirrors formatting changes in legacy API tests.
docs/notebooks/temporal/05-accumulation-to-rate-examples.ipynb	Notebook cell formatting updates consistent with Ruff formatting.
docs/notebooks/temporal/03-seas5-daily-statistics.ipynb	Notebook cell formatting updates.
docs/notebooks/temporal/02-era5-daily-monthly-statistics.ipynb	Notebook cell formatting updates.
docs/notebooks/spatial/02-era5-reduce-data-over-geometries.ipynb	Notebook cell formatting updates.

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[EddyCMWF]

Hi Oskar,
Approved and merged, however in preparation for version 1.0.0 I have been working on a release candidate branch, and I have a feeling this may lead to conflicts. I will see what I can merge.
Thanks,
Eddy

[mcocdawc]

Great, thank you very much.