Use the parent's logging context name for runWithConnection. (#9895)

This fixes a regression where the logging context for runWithConnection
was reported as runWithConnection instead of the connection name,
e.g. "POST-XYZ".

changelog.d/9895.bugfix

@@ -0,0 +1 @@
+Fix a bug introduced in v1.32.0 where the associated connection was improperly logged for SQL logging statements.

synapse/storage/database.py

@@ -715,7 +715,9 @@ class DatabasePool:
             # pool).
             assert not self.engine.in_transaction(conn)
 
-            with LoggingContext("runWithConnection", parent_context) as context:
+            with LoggingContext(
+                str(curr_context), parent_context=parent_context
+            ) as context:
                 sched_duration_sec = monotonic_time() - start_time
                 sql_scheduling_timer.observe(sched_duration_sec)
                 context.add_database_scheduled(sched_duration_sec)