Internal User Endpoint - vulnerability fix + response type fix

[krrishdholakia]

Title

• fix(key_management_endpoints.py): fix vulnerability where a user could update another user's keys
• fix(internal_user_endpoints.py): return model max budget in internal user create response

Relevant issues

Resolves #8031
Fixes #7047

Type

🐛 Bug Fix
✅ Test

Changes

• adds a common key access check across /key/generate + /key/update
• adds unit testing for isolated user changes across update + delete endpoints
• updates new user response dictionary - return model_max_budget

[REQUIRED] Testing - Attach a screenshot of any new tests passing locally

If UI changes, send a screenshot/GIF of working UI fixes

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 4, 2025 6:45am

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...y/management_endpoints/key_management_endpoints.py	61.53%	5 Missing ⚠️

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