fix(httpx): Consistently early-exit when adding request source (#6151)

Preserve the early-exit behavior when the client is inactive for both trace lifecycles.

Follow-up on 409a779.

Author: alexander-alderman-webb

sentry_sdk/tracing_utils.py

@@ -353,11 +353,10 @@ def add_http_request_source(
     Adds OTel compatible source code information to a span for an outgoing HTTP request
     """
     client = sentry_sdk.get_client()
+    if not client.is_active():
+        return
 
     if isinstance(span, LegacySpan):
-        if not client.is_active():
-            return
-
         # In the StreamedSpan case, we need to add the extra span information before
         # the span finishes, so it's expected that this will be None. In the LegacySpan case,
         # it should already be finished.