🤖 Fix file-copy issue due to nonexistent source file

[sentry-autofix]

👋 Hi there! This PR was automatically generated 🤖

The application fails to copy a file because the source file does not exist. This is happening during the process of loading the repository to a temporary directory, specifically when attempting to move or copy items from the extracted tarball's root folder to the target directory. To resolve this issue, we need to ensure that before attempting to copy or move, we check if the source file/directory exists.

The steps that were performed:

1. Check file existence before moving
2. Log missing files during loading

The issue that triggered this PR:

https://sentry.io/organizations/sentry/issues/5028961086/

📣 Instructions for the reviewer which is you, yes you:

• If these changes were incorrect, please close this PR and comment explaining why.
• If these changes were incomplete, please continue working on this PR then merge it.
• If you are feeling confident in my changes, please merge this PR.

This will greatly help us improve the autofix system. Thank you! 🙏

If there are any questions, please reach out to the AI/ML Team on #proj-suggested-fix

🤓 Stats for the nerds:

Prompt tokens: 90106
Completion tokens: 2178
Total tokens: 92284