- When user explicitly declined tracing, skip the 'Tracing is disabled'
message instead of showing it on every crew/flow execution
- Add CREWAI_SUPPRESS_TRACING_MESSAGES env var to let users fully
suppress the message
- Remove duplicate identical if/else branches in all four
_show_tracing_disabled_message implementations
- Add 24 tests covering suppression via env var, context var, and
user-declined scenarios
Co-Authored-By: João <joao@crewai.com>