build: modernize repo-tools-data-schema 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-data-schema`
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/pycodestyle as on master
• Add CI workflow using `astral-sh/setup-uv`; SHA-pin all actions
• Set `requires-python = ">=3.12"` (first explicit Python version requirement for this repo)

Removed/Updated

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

Updated Makefile targets:

Target	Change
`upgrade`	Was pip-compile based; now runs `edx_lint write_uv_constraints` + `uv lock --upgrade`
`requirements`	Now runs `uv sync --group dev` + `uv tool install tox --with tox-uv`
`docs`	New target added to validate RST files via `doc8`

Versioning

`version = "2.0"` declared directly in `pyproject.toml` — master had no PyPI publish workflow, 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 `src/` layout was not adopted.
• `release.yml` was not added because this repo has no PyPI publish workflow on master.

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 requirements`, `make lint`, `make test`). 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.
⚠️ Please upload report for BASE (main@b0a346f). Learn more about missing BASE report.

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

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #42   +/-   ##
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  Coverage        ?   35.59%           
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  Files           ?        2           
  Lines           ?       59           
  Branches        ?        0           
=======================================
  Hits            ?       21           
  Misses          ?       38           
  Partials        ?        0           

Flag	Coverage Δ
unittests	35.59% <60.00%> (?)

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