[codex] Publish PyPI artifacts from GitHub release assets

[FlorianPfaff]

Summary

• Make the manual release_tag input optional; when it is left blank, the workflow resolves the latest GitHub Release and uses that tag.
• Default manual publishes to PyPI while keeping TestPyPI selectable.
• Download wheel and sdist assets from the resolved GitHub Release for both automatic and manual publishes.
• Remove the manual poetry build path so PyPI/TestPyPI receives the same artifacts that are attached to the GitHub Release.

Validation

• Reviewed the generated diff for .github/workflows/publish-to-pypi.yml.
• Did not run actionlint because this environment does not have a local checkout of the repository.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	11.46s
✅ JSON	prettier	2	0	0	0	0.5s
✅ JSON	v8r	2		0	0	2.42s
✅ MARKDOWN	markdownlint	2	0	0	0	0.69s
✅ MARKDOWN	markdown-table-formatter	2	0	0	0	0.2s
✅ PYTHON	bandit	366		0	0	5.08s
✅ PYTHON	black	366	12	0	0	7.38s
✅ PYTHON	flake8	366		0	0	2.67s
✅ PYTHON	isort	366	13	0	0	0.69s
✅ PYTHON	mypy	366		0	0	4.68s
✅ PYTHON	pylint	366		0	0	104.48s
✅ PYTHON	ruff	366	13	0	0	0.07s
✅ REPOSITORY	checkov	yes		no	no	21.22s
✅ REPOSITORY	gitleaks	yes		no	no	6.65s
✅ REPOSITORY	git_diff	yes		no	no	0.1s
✅ REPOSITORY	secretlint	yes		no	no	7.02s
✅ REPOSITORY	syft	yes		no	no	3.21s
✅ REPOSITORY	trivy-sbom	yes		no	no	1.97s
✅ REPOSITORY	trufflehog	yes		no	no	17.93s
✅ YAML	prettier	4	0	0	0	0.43s
✅ YAML	v8r	4		0	0	5.28s
✅ YAML	yamllint	4		0	0	0.48s

See detailed reports in MegaLinter artifacts

Your project could benefit from a custom flavor, which would allow you to run only the linters you need, and thus improve runtime performances. (Skip this info by defining FLAVOR_SUGGESTIONS: false)

• Documentation: Custom Flavors
• Command: npx mega-linter-runner@9.4.0 --custom-flavor-setup --custom-flavor-linters PYTHON_PYLINT,PYTHON_BLACK,PYTHON_FLAKE8,PYTHON_ISORT,PYTHON_BANDIT,PYTHON_MYPY,PYTHON_RUFF,COPYPASTE_JSCPD,JSON_V8R,JSON_PRETTIER,MARKDOWN_MARKDOWNLINT,MARKDOWN_MARKDOWN_TABLE_FORMATTER,REPOSITORY_CHECKOV,REPOSITORY_GIT_DIFF,REPOSITORY_GITLEAKS,REPOSITORY_SECRETLINT,REPOSITORY_SYFT,REPOSITORY_TRIVY_SBOM,REPOSITORY_TRUFFLEHOG,YAML_PRETTIER,YAML_YAMLLINT,YAML_V8R

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