CG-17782: Update codegen to store all repos in /tmp/{org_name}

[codegen-sh]

This PR updates the repository storage path to use /tmp/{org_name}/{repo_name} instead of just /tmp/{repo_name}.

Changes:

1. Modified RepoConfig.repo_path property to include the organization name in the path when available
2. Updated RepoOperator.repo_path property to use the path from RepoConfig
3. Updated RepoOperator.setup_repo_dir method to create the organization directory structure

This change ensures that repositories from different organizations are stored in separate directories, which helps prevent conflicts when working with repositories that have the same name but belong to different organizations.

Fixes Linear issue CG-17782.

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💻 View my work • About Codegen

[codegen-sh]

Hey! 👋 I see one of the checks failed. I am on it! 🫡

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[codegen-sh]

I'm working on fixing the failing checks in PR #1071. I've already fixed the mypy errors in repo_config.py by properly handling None values and added comprehensive unit tests. The changes are now pushed to the PR branch. I'm waiting for the CI checks to complete to confirm everything is working correctly.

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[codegen-sh]

🧩 I need a bit more direction!

This task is complex - could you break it down into smaller steps?
For best results, try to add specific context, explicitly mention symbol names, etc.

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