Merge #20748: test: Add race:SendZmqMessage tsan suppression

fa957f8 test: Add race:SendZmqMessage tsan suppression (MarcoFalke)

Pull request description:

  Add suppression for `race:SendZmqMessage`, which isn't covered by the existing `zmq::*` suppression

  Fixes #20618

ACKs for top commit:
  hebasto:
    re-ACK fa957f8, as my previous comment is not directly related to this pull changes.

Tree-SHA512: 8642a8b79bbfa4bee89042b66e528f27fd78c5e84a33023df440662e9114e31445fd7b04940f44b11fa4ab7438d346385a21816289c818cce9958a9b16730452

Author: MarcoFalke

test/sanitizer_suppressions/tsan

@@ -1,5 +1,7 @@
 # ThreadSanitizer suppressions
 # ============================
+#
+# https://github.com/google/sanitizers/wiki/ThreadSanitizerSuppressions
 
 # double locks (TODO fix)
 mutex:g_genesis_wait_mutex
@@ -43,5 +45,14 @@ deadlock:src/qt/test/*
 deadlock:libdb
 race:libzmq
 
+# Intermittent issues
+# -------------------
+#
+# Suppressions that follow might only happen intermittently, thus they are not
+# reproducible. Make sure to include a link to a full trace.
+
+# https://github.com/bitcoin/bitcoin/issues/20618
+race:CZMQAbstractPublishNotifier::SendZmqMessage
+
 # https://github.com/bitcoin/bitcoin/pull/20218, https://github.com/bitcoin/bitcoin/pull/20745
 race:epoll_ctl