test: add unit tests for github

[anakin87]

Proposed Changes:

• add more unit tests for GitHub integration, focusing on uncovered code paths (total coverage was below our 90% standard)

How did you test it?

CI

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.

[github-actions]

Coverage report (github)

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
integrations/github/src/haystack_integrations/components/connectors/github
file_editor.py
pr_creator.py
repo_forker.py
repo_viewer.py
integrations/github/src/haystack_integrations/tools/github
utils.py
Project Total

This report was generated by python-coverage-comment-action