conn: Notify btrack subsys on normal OR conn close

Fixes #40604

Signed-off-by: David Goulet <dgoulet@torproject.org>

changes/ticket40604

+  o Major bugfixes (relay):
+    - Remove OR connections btrack subsystem entries when the connections
+      closes normally. Before this, we would only close it on error and thus
+      leaking memory for each normal OR connections. Fixes bug 40604; bugfix
+      on 0.4.0.1-alpha.

src/core/or/connection_or.c

@@ -799,6 +799,10 @@ connection_or_about_to_close(or_connection_t *or_conn)
   } else if (!tor_digest_is_zero(or_conn->identity_digest)) {
     connection_or_event_status(or_conn, OR_CONN_EVENT_CLOSED,
                 tls_error_to_orconn_end_reason(or_conn->tls_error));
+  } else {
+    /* Normal close, we notify of a done connection. */
+    connection_or_event_status(or_conn, OR_CONN_EVENT_CLOSED,
+                               END_OR_CONN_REASON_DONE);
   }
 }