refactor: add fixtures for test loggers and update database schema

[manojkumargogula]

Fix CI build issues in test infrastructure

Relevant issues
Addresses pytest collection warnings in test classes
Resolves unknown pytest marker warnings
Fixes Python 3.10 compatibility issues

Pre-Submission checklist
[x] I have Added testing in the tests/litellm/ directory
[x] I have added a screenshot of my test passing locally
[x] My PR passes all unit tests on make test-unit
[x] My PR's scope is as isolated as possible, it only solves 1 specific problem

Type
🐛 Bug Fix
🧹 Refactoring
✅ Test

Changes
This PR addresses CI build failures by:

• Converting test classes with init constructors to use fixtures instead, fixing PytestCollectionWarning
• Registering the flaky marker in conftest.py to resolve PytestUnknownMarkWarning
• Adding Python 3.10 compatibility for datetime.UTC imports
• Increasing GitHub workflow timeout to prevent CI failures
• These changes ensure tests run successfully in both local and CI environments without warnings.

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 4, 2025 0:19am