refactor(backend): Remove un-needed join in `fix_llm_provider_credentials` query

[majdyz]

Changes 🏗️

Removed the join table that was not used in the query on fix_llm_provider_credentials.

Checklist 📋

For code changes:

• [ ] I have clearly listed my changes in the PR description
• [ ] I have made a test plan
• [ ] I have tested my changes according to the test plan:
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Example test plan

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Examples of configuration changes

- Changing ports - Adding new services that need to communicate with each other - Secrets or environment variable changes - New or infrastructure changes such as databases

[codiumai-pr-agent-pro[bot]]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Query Results The updated query now gets user_id from graph."userId" instead of User.id. Verify that these values are equivalent and the change won't affect downstream logic.

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