* test: add more unit testing for team member add
* fix(team_endpoints.py): add validation check to prevent same user from being added to team again
prevents duplicates
* fix(team_endpoints.py): raise error if `/team/member_delete` called on member that's not in team
prevent being able to call delete on same member multiple times
* test: update initial tests
* test: fix test
* test: update test to handle no member duplication
* fix(deepseek/chat): convert content list to str
Fixes https://github.com/BerriAI/litellm/issues/6642
* test(test_deepseek_completion.py): implement base llm unit tests
increase robustness across providers
* fix(router.py): support content policy violation fallbacks with default fallbacks
* fix(opentelemetry.py): refactor to move otel imports behing flag
Fixes https://github.com/BerriAI/litellm/issues/6636
* fix(opentelemtry.py): close span on success completion
* fix(user_api_key_auth.py): allow user_role to default to none
* fix: mark flaky test
* fix(opentelemetry.py): move otelconfig.from_env to inside the init
prevent otel errors raised just by importing the litellm class
* fix(user_api_key_auth.py): fix auth error
this also removes the functionality for modifying membership via `/team/update`. This is not considered a breaking change, as we've been pointing to usage of `/team/member_add` and `/team/member_delete` for this. Previous behaviour for this endpoint was causing it to be non-functional. If you're impacted, please let us know.
