chore: Deprecate same_process_as_parent (#4244)

Preparing to remove this in #4201

Author: sentrivana

sentry_sdk/tracing.py

@@ -323,6 +323,13 @@ def __init__(
 
             self.scope = self.scope or hub.scope
 
+        if same_process_as_parent is not None:
+            warnings.warn(
+                "The `same_process_as_parent` parameter is deprecated.",
+                DeprecationWarning,
+                stacklevel=2,
+            )
+
         if start_timestamp is None:
             start_timestamp = datetime.now(timezone.utc)
         elif isinstance(start_timestamp, float):