(security) prevent user key from updating other user keys + don't return all keys with blank key alias on /v2/key/info

[krrishdholakia]

Title

Relevant issues

Pre-Submission checklist

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• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
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Type

🆕 New Feature
🐛 Bug Fix
🧹 Refactoring
📖 Documentation
🚄 Infrastructure
✅ Test

Changes

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Project	Deployment	Preview	Comments	Updated (UTC)
litellm	Ready	Preview	Comment	Oct 3, 2025 0:30am

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ krrishdholakia
❌ DrQuacks
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[krrishdholakia]

Closing in favor of #15201