* feat: add ruff linter with ci check
Liniting the python files in tests directory would reduce whitespace etc
change and enforce basic coding standard for those. Kind of
opportunistic PR as there might be other opinions about how to deal with
this.
* fix: format with ruff
* doc(tests/README.md): explain the unit test process
* test(TempRepository): support to change origin and get filename
* refactor: simplify the case code
* test_git_browse_ci.py
* test_git_browse.py
* fix: rename `test_authors.py` to `test_git_authors.py`
* fix: typo
* fix: log the GitCommandError
