chore(deps,tooling): move dev extras to dependency-group

[danceratopz]

🗒️ Description

tldr

1. Fix testing package by adding ruff as a dep (required by gentest).
2. Move developer dependencies from "extras" (optional dependencies) to PEP 753 "dependency groups".

What changes?

Developers need to run:

uv sync

to get all dev dependencies (previously it was uv sync --all-extras).

More Background

These changes follow a retroactive review of #1671, sorry, I was too slow @fselmo!

I think the standard way of adding dev dependencies is not as an "extra", but rather as a dependency-group:

uv reads development dependencies from the [dependency-groups] table (as defined in PEP 735).

The dev group is special-cased and synced by default.
From https://docs.astral.sh/uv/concepts/projects/sync/#syncing-development-dependencies

So this PR makes that change and additionally removes tox as a direct dev dependency; imo, it should be ran as a "tool" via uvx; the doc changes already made in

• chore: remove unnecessary flag from tox commands #1668

reflect that.

Before this PR:

uv sync --extras dev  # unnecessary
uv run tox -e static  # feels a bit weird

With this PR:

uv sync  # installs dev deps by default
uvx tox -e static  # treat tox as a tool

It's great that we get to drop the --with=tox-uv flag!

🔗 Related Issues or PRs

N/A.

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx tox -e static

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered adding an entry to CHANGELOG.md. skipped
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.07%. Comparing base (abd7612) to head (bd5dbd3).
⚠️ Report is 3 commits behind head on forks/osaka.
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Additional details and impacted files

@@             Coverage Diff              @@
##           forks/osaka    #1688   +/-   ##
============================================
  Coverage        86.07%   86.07%           
============================================
  Files              743      743           
  Lines            44078    44078           
  Branches          3894     3894           
============================================
  Hits             37938    37938           
  Misses            5659     5659           
  Partials           481      481           

Flag	Coverage Δ
unittests	86.07% <ø> (ø)

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[danceratopz]

@fselmo @SamWilsn let me know if you like it, I can make a follow-up to update the docs.

[danceratopz]

I fixed up a packaging bug in testing that cropped up due to these changes; it was missing ruff as a dependency.

[fselmo]

lgtm once CI passes 👍🏼

[danceratopz]

lgtm once CI passes 👍🏼

Thanks, now we're failing testing unit tests (here) due to the issue that @felix314159 is addressing here

• fix(pytest): fix failing unit test test_model_copy[Environment] #1711

[fselmo]

Yep sounds good on CI fix in separate PR if you're good with it 👍🏼