build: modernize openedx-webhooks to use uv and pyproject.toml

[farhan]

Important

PR implemented with the assistance of Claude Code. Refined and validated before being submitted for code review.

Modernize `openedx-webhooks`
Part of openedx/public-engineering#506

Summary

• Replace `setup.py`/`setup.cfg` with `pyproject.toml` (PEP 621 static metadata)
• Switch from pip-compile to `uv` with PEP 735 dependency groups; commit `uv.lock`
• Retain pylint/isort/mypy as on master
• Coverage config moved into `pyproject.toml`
• Update CI to use `astral-sh/setup-uv`; SHA-pin all actions; split into separate `run_tests` (produces "Tests (ubuntu-latest, 3.12)" check) and `quality_and_docs` jobs

Removed/Updated

Deleted files: `setup.py`, `setup.cfg`, `requirements/`, `.coveragerc`

Removed Makefile targets:

Target	Reason
`compile-requirements`	Replaced by `uv lock --upgrade` in the `upgrade` target
`pip-compile`	Replaced by `uv lock`
`pip-compile-upgrade`	Replaced by `uv lock --upgrade`

Updated Makefile targets:

Target	Change
`upgrade`	Now runs `edx_lint write_uv_constraints` + `uv lock --upgrade` instead of `pip-compile`
`upgrade-package`	Now runs `uv lock --upgrade-package $(package)` instead of `pip-compile`
`install-dev-requirements`	Now runs `uv sync --group dev` + `uv tool install tox --with tox-uv` instead of `pip-sync`
`pylint`	Removed `setup.py` argument — it was the only root-level `.py` file and is now deleted
`check-pyproject.toml`	Renamed from `check-setup.py`; validates `pyproject.toml` via `tomllib` instead of running `python setup.py check`

Versioning

Static: `version = "0.1.0"` declared directly in `pyproject.toml` — this repo does not publish to PyPI, so `setuptools-scm` is not used and the version is bumped manually on each release tag.

Important Notes

• This repo does not publish to PyPI, so `python-semantic-release` and `release.yml` were not added.
• `src/` layout was not adopted — this repo does not publish to PyPI, so the flat layout is retained.

Testing Notes

This PR has not been manually tested against the repo's own features. Testing relied on CI checks and local agent tooling (`make install-dev-requirements`, `uv run tox -e py`, `uv run tox -e quality`, `uv run tox -e docs`). Repo-owner is encouraged to run the repo's feature tests before merging.

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🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.79%. Comparing base (2922109) to head (7f73673).

Files with missing lines	Patch %	Lines
openedx_webhooks/__init__.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #440      +/-   ##
==========================================
- Coverage   89.84%   89.79%   -0.06%     
==========================================
  Files          38       38              
  Lines        3103     3107       +4     
  Branches      239      239              
==========================================
+ Hits         2788     2790       +2     
- Misses        281      283       +2     
  Partials       34       34              

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