build: Modernize xapi-db-load: migrate to uv, pyproject.toml, PEP 735 dependency groups

[farhan]

Important

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

Modernize `xapi-db-load`
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/pydocstyle/mypy as on master.
• Coverage config moved into `pyproject.toml`
• Update CI to use `astral-sh/setup-uv`; SHA-pin all actions

Removed/Updated

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

Updated Makefile targets:

Target	Change
`upgrade`	Replaced pip-compile workflow with `uv run edx_lint write_uv_constraints` + `uv lock --upgrade`
`requirements`	Replaced pip-sync with `uv sync --group dev` + `uv tool install tox --with tox-uv`
`quality`	Removed `*.py` glob from linter commands (`setup.py` was the only root-level `.py` file; glob would expand to nothing after deletion); replaced `python setup.py bdist_wheel` with `uv run python -m build`

Versioning

`version = "3.1.0"` 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.
• This repo has no PyPI publish workflow on master, so `python-semantic-release` and `release.yml` were not added.
• `codecov.yml` was deleted because it contained a hardcoded 74 % patch-coverage target that is not enforced by any current CI gate; Codecov config can be re-added with deliberate thresholds if desired.

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`, `python -m build`). Repo-owner is encouraged to run the repo's feature tests before merging.

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🤖 Generated with Claude Code

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[irfanuddinahmad]

Solid migration overall — dependency list matches 1:1 with the old requirements/base.in, version handling is consistent, and I also want to flag a nice incidental fix: MANIFEST.in's recursive-include xapi-db-load ... (hyphen — never matched the real xapi_db_load package dir) is corrected to the underscore form. Worth a line in the PR description since it's a real behavior change, not just tooling.

One gap worth closing before merge:

tox.ini's envlist gains docs and quality (envlist = py312, docs, quality), and both env definitions are correctly wired to dependency_groups. But .github/workflows/ci.yml's matrix still only runs toxenv: [py]. So make quality (pylint/pycodestyle/pydocstyle/mypy/isort) and the docs build still never run in CI — same gap as before this PR, but now that the scaffolding exists, it'd be low-cost to close it. forum#283 (same author, same day) does add quality/docs to its CI matrix — worth matching that here for consistency.