I refactored the Git utility functions to remove GitHub-specific logic, making them compatible with any Git host. This involved deprecating GitHub-specific checks and exceptions, and switching to git ls-remote for repository existence checks, significantly improving the tool's versatility.

• I removed the is_github_host function and its associated import from src/gitingest/utils/git_utils.py and src/gitingest/clone.py, as it's no longer needed.
• I refactored the check_repo_exists function in src/gitingest/utils/git_utils.py to use git ls-remote instead of HTTP HEAD requests to the GitHub API. This makes the repository existence check generic for any Git host.
• I removed the InvalidGitHubTokenError exception from src/gitingest/utils/exceptions.py and its related parsing logic, simplifying error handling.
• I updated fetch_remote_branches_or_tags, checkout_partial_clone, resolve_commit, and _resolve_ref_to_sha in src/gitingest/utils/git_utils.py to apply authentication tokens to any Git host, removing the previous is_github_host condition.
• I removed the test_is_github_host test and updated test_create_git_auth_header_with_ghe_url to test_create_git_auth_header_with_different_hostnames in tests/test_git_utils.py to reflect the broader applicability of authentication.

4 tasks completed

• Identifier les tests qui échouent
• Corriger les imports manquants dans les tests
• Corriger les tests qui utilisent encore is_github_host
• Vérifier que tous les tests passent

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