Remove logging setting from global context (#2720)

This commit fixes a bug where changing logging level would be overriden
by `src/crewai/project/crew_base.py`. For example, the following snippet
on top of a crew or flow would not work:

```python
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)
```

Crews and flows should be able to set their own log level, without being
overriden by CrewAI library code.

src/crewai/project/crew_base.py

@@ -8,8 +8,6 @@ from dotenv import load_dotenv
 
 load_dotenv()
 
-logging.basicConfig(level=logging.WARNING)
-
 T = TypeVar("T", bound=type)
 
 """Base decorator for creating crew classes with configuration and function management."""