* Fix broken mocks in 6 flaky tests to prevent real API calls
Added network-level HTTP blocking using respx to prevent tests from making real API calls when Python-level mocks fail. This makes tests more reliable and retryable in CI.
Changes:
- Azure OIDC test: Added Azure Identity SDK mock to prevent real Azure calls
- Vector store test: Added @respx.mock decorator to block HTTP requests
- Resend email tests (3): Added @respx.mock decorator for all 3 test functions
- SendGrid email test: Added @respx.mock decorator
All test assertions and verification logic remain unchanged - only added safety nets to catch leaked API calls.
* Fix failing OIDC secret manager tests
Fixed two test failures in test_secret_managers_main.py:
1. test_oidc_azure_ad_token_success: Corrected the patch path for get_bearer_token_provider from 'litellm.secret_managers.get_azure_ad_token_provider.get_bearer_token_provider' to 'azure.identity.get_bearer_token_provider' since the function is imported from azure.identity.
2. test_oidc_google_success: Added @patch('httpx.Client') decorator to prevent any real HTTP connections during test execution, resolving httpx.ConnectError issues.
Both tests now pass successfully.
