feat: Remove early return for NoOpStreamedSpan in set_transaction_name() (#7164)

Ensure that the transaction name and source are set on the scope when the trace is not sampled, so that they are still applied to error events.
This aligns the streaming trace lifecycle with the transaction-based lifecycle.

Author: alexander-alderman-webb

sentry_sdk/scope.py

@@ -861,10 +861,7 @@ def set_transaction_name(self, name: str, source: "Optional[str]" = None) -> Non
         """Set the transaction name and optionally the transaction source."""
         self._transaction = name
         if self._span:
-            if isinstance(self._span, NoOpStreamedSpan):
-                return
-
-            elif isinstance(self._span, StreamedSpan):
+            if isinstance(self._span, StreamedSpan):
                 self._span._segment.name = name
                 if source:
                     self._span._segment.set_attribute(