fix: return 404 instead of 500 for non-existent team in permissions_update

[AlanPonnachan]

return 404 instead of 500 for non-existent team in permissions_update

Relevant issues

Fixes #16814

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Type

🐛 Bug Fix

Changes

The /team/permissions_update endpoint was throwing an unhandled exception when get_team_object failed to find a team (raising a generic Exception), resulting in a 500 Internal Server Error.

Changes made:

1. Modified litellm/proxy/management_endpoints/team_endpoints.py: Wrapped the get_team_object call in a try/except block. It now catches the exception and raises a proper HTTPException(status_code=404) if the team is not found, consistent with other team endpoints.
2. Added test_update_team_permissions_fail_team_not_found to tests/test_litellm/proxy/management_endpoints/test_team_endpoints.py to verify that a non-existent team ID returns a 404 status code instead of crashing.

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