Fix CI and DEV workflows to use the current test directory

[naotohayashi1991]

The CI and DEV workflows still reference root-level test.py and test_release.py after the tests moved into tests/. Their pycodestyle step fails with E902, and pytest exits with code 4 without collecting tests.

Update both workflows to run pycodestyle and pytest against tests/, matching the current test layout and including the uppercase regression tests.

Validation on Linux with CPython 3.12.3 and the text-unidecode backend: 123 tests passed; the workflows' pycodestyle and flake8 commands passed; git diff --check passed. The full interpreter matrix and hosted GitHub Actions have not been run.

AI disclosure: this patch and description were prepared using OpenAI Codex.

[coveralls]

coverage: 98.758%. remained the same — naotohayashi1991:item-369/fix-workflow-test-paths into un33k:master

[un33k]

Thank you, @naotohayashi1991 — great catch. When the suite moved into tests/, these two workflows were left pointing at the old root test.py/test_release.py, which is exactly why the pycodestyle step hit E902 and pytest exited without collecting anything. Pointing both at tests/ is the correct fix.

Verified locally: pytest tests collects all 123 tests and the workflow's pycodestyle ... slugify tests setup.py passes clean. Merging now. Since this only updates CI workflow files (no packaged code changes), it doesn't need a release of its own.

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