* fix(spend_tracking_utils.py): add user agent tags from standard logging payload, in spend logs payload
* feat(litellm_logging.py): identify user agent tags as `User-Agent: ..` and allow admin to disable storing user agent as tag
* fix(azure_ai/): pass content type header in azure ai request
Fixes https://github.com/BerriAI/litellm/issues/11227
* test: add unit test
* fix(router.py): fix passing dynamic credentials to retrieve batch
Fixes batch retrieval when using router
* test: add more unit tests
* add unit testing for standard logging payload
* unit testing for static methods in litellm_logging
* add code coverage check for litellm_logging
* litellm_logging_code_coverage
* test_get_final_response_obj
* fix validate_redacted_message_span_attributes
* test validate_redacted_message_span_attributes
Krish Dholakia