🤖 Integrate autoflush control in database transactions

[sentry-autofix]

👋 Hi there! This PR was automatically generated 🤖

The issue occurs due to an IntegrityError during a database operation, related to autoflush behavior in a session context. To address this, we will implement session control to disable autoflush specifically in the contexts where the error happens. This prevents unintentional flushes that can lead to IntegrityErrors, ensuring database operations complete as expected.

The steps that were performed:

1. Disable session autoflush in ProcessRequest.acquire_work
2. Disable session autoflush in CodebaseIndex.cleanup
3. Disable session autoflush in CodebaseIndex.update_document_temporarily

The issue that triggered this PR:

https://sentry.io/organizations/sentry/issues/5031851841/

📣 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: 39348
Completion tokens: 1065
Total tokens: 40413