* fix(internal_user_endpoints.py): initial commit removing logic to create new budget for new user if default max budget in team set
* feat(proxy_setting_endpoints.py): update team member budget when set via default internal user endpoint
removes need to create a unique budget per user
* feat(proxy_server.py): set team max member budget on startup, if set on config.yaml
* fix(prometheus.py): support custom tags for tracking on prometheus
Allows tracking user agent values on prometheus metrics
* test(test_internal_user_endpoints.py): fix test
