Merge bitcoin/bitcoin#32703: test: Explain how to reproduce zmq:: upstream race

fa0b766 test: Remove intermittent and presumed fixed tsan race suppressions (MarcoFalke)
fa4b659 test: Explain how to reproduce zmq:: upstream race (MarcoFalke)

Pull request description:

  An explanation makes it easier to reproduce, if needed.

ACKs for top commit:
  fanquake:
    ACK fa0b766

Tree-SHA512: 4857cc1e2c97e3d8c194fd12d0bb2a3293136c51ae1b89e0320161d1b8f22ef5122519e099288e52e42bb828ee4a56bfdfbe80717d95178748b76dd7209e12db

Author: fanquake

test/sanitizer_suppressions/tsan

@@ -3,12 +3,6 @@
 #
 # https://github.com/google/sanitizers/wiki/ThreadSanitizerSuppressions
 
-# race (TODO fix)
-race:LoadWallet
-race:DatabaseBatch
-race:zmq::*
-race:bitcoin-qt
-
 # deadlock (TODO fix)
 # To reproduce, see:
 # https://github.com/bitcoin/bitcoin/issues/19303#issuecomment-1514926359
@@ -17,13 +11,18 @@ deadlock:Chainstate::ConnectTip
 # Intentional deadlock in tests
 deadlock:sync_tests::potential_deadlock_detected
 
-# Wildcard for all gui tests, should be replaced with non-wildcard suppressions
+# Wildcard for all of the gui, should be replaced with non-wildcard suppressions
+race:bitcoin-qt
 race:src/qt/test/*
 deadlock:src/qt/test/*
 
 # External libraries
+# ------------------
 race:libzmq
 
+# To reproduce, build from depends with CFLAGS='-O0 -g' CXXFLAGS='-O0 -g'
+race:zmq::*
+
 # Intermittent issues
 # -------------------
 #