Add Scarf analytics tracking (#3086)

* Add Scarf analytics tracking

* Fix bandit security warning for urlopen

* Fix linting errors

* Refactor telemetry: reuse existing logic and simplify exceptions

src/crewai/telemetry/telemetry.py

@@ -111,11 +111,13 @@ class Telemetry:
                 raise  # Re-raise the exception to not interfere with system signals
             self.ready = False
 
-    def _is_telemetry_disabled(self) -> bool:
+    @classmethod
+    def _is_telemetry_disabled(cls) -> bool:
         """Check if telemetry should be disabled based on environment variables."""
         return (
             os.getenv("OTEL_SDK_DISABLED", "false").lower() == "true"
             or os.getenv("CREWAI_DISABLE_TELEMETRY", "false").lower() == "true"
+            or os.getenv("CREWAI_DISABLE_TRACKING", "false").lower() == "true"
         )
 
     def _should_execute_telemetry(self) -> bool: