refactor: use pathlib utilities to shorten code

[bearomorphism]

Description

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Steps to Test This Pull Request

Run uv run poe test.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.98%. Comparing base (a03739f) to head (16d8ee8).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1855      +/-   ##
==========================================
- Coverage   97.99%   97.98%   -0.01%     
==========================================
  Files          60       60              
  Lines        2692     2684       -8     
==========================================
- Hits         2638     2630       -8     
  Misses         54       54              

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[Copilot]

Pull request overview

Refactors file IO across core Commitizen commands/config and the test suite to use pathlib.Path convenience APIs (read_text, read_bytes, write_bytes, etc.), reducing boilerplate and aligning IO patterns.

Changes:

• Replace open(...).read()/Path.open(...).read() patterns with Path.read_text() in tests and info() helpers.
• Replace binary config reads/writes with Path.read_bytes() / Path.write_bytes() in TOML config handling and config loading.
• Adjust a commit-command test fixture to write/read the backup message using Path utilities and correct working-directory expectations.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_conf.py	Simplifies TOML config content assertions using Path.read_text().
tests/test_changelog.py	Uses Path.read_text() for loading changelog fixture content.
tests/test_bump_update_version_in_files.py	Replaces manual file opening with Path.read_text() when aggregating regression output.
tests/conftest.py	Switches to append-mode writes via open(..., "a") for generated pyproject.toml test content.
tests/commands/test_init_command.py	Reads generated config files via Path.read_text() and parses JSON/YAML from strings.
tests/commands/test_commit_command.py	Updates backup-message fixture to use Path.write_text() and ensure correct cwd for the command.
tests/commands/test_check_command.py	Updates mocks to patch Path.read_text() instead of open().
tests/commands/test_changelog_command.py	Replaces repeated file reads with Path.read_text() across changelog command tests.
tests/commands/test_bump_command.py	Uses append-mode Path.open("a") and Path.read_text() for assertions on bumped files.
commitizen/cz/jira/jira.py	Uses Path.read_text() for bundled info text.
commitizen/cz/customize/customize.py	Uses Path(info_path).read_text() for external info file support.
commitizen/cz/conventional_commits/conventional_commits.py	Uses Path.read_text() for bundled info text.
commitizen/config/toml_config.py	Simplifies TOML reads/writes with read_bytes() / write_bytes().
commitizen/config/init.py	Loads config bytes via Path.read_bytes() when creating config objects.
commitizen/commands/commit.py	Uses Path.read_text() when reading the temporary editor file and backup message.
commitizen/commands/check.py	Uses Path.read_text() to load commit messages from --commit-msg-file.

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[bearomorphism]

@copilot what can you assist me with this PR?

[Copilot]

@bearomorphism I've opened a new pull request, #1856, to work on those changes. Once the pull request is ready, I'll request review from you.

[bearomorphism]

Thanks for quick review, Santi!