fix(scope): Clear last_event_id on scope clear

Co-authored-by: Adam Johnson <me@adamj.eu>

Author: szokeasaurusrex

sentry_sdk/scope.py

@@ -208,9 +208,6 @@ def __init__(self, ty=None, client=None):
         incoming_trace_information = self._load_trace_data_from_env()
         self.generate_propagation_context(incoming_data=incoming_trace_information)
 
-        # self._last_event_id is only applicable to isolation scopes
-        self._last_event_id = None  # type: Optional[str]
-
     def __copy__(self):
         # type: () -> Scope
         """
@@ -680,6 +677,9 @@ def clear(self):
 
         self._propagation_context = None
 
+        # self._last_event_id is only applicable to isolation scopes
+        self._last_event_id = None  # type: Optional[str]
+
     @_attr_setter
     def level(self, value):
         # type: (LogLevelStr) -> None