Merge bitcoin#34690: test: Add missing timeout_factor to zmq socket

fa48f8c test: Add missing timeout_factor to zmq socket (MarcoFalke)

Pull request description:

  Fixes bitcoin#34189

  Otherwise, the test may intermittently fail on slow CI systems that have `--timeout-factor=` properly set.

  It can be tested by running `./bld-cmake/test/functional/interface_zmq.py --timeout-factor=10` with this diff:

  ```diff
  diff --git a/src/validationinterface.cpp b/src/validationinterface.cpp
  index c7be6ab..b14cf2aee6 100644
  --- a/src/validationinterface.cpp
  +++ b/src/validationinterface.cpp
  @@ -166,2 +166,3 @@ void ValidationSignals::SyncWithValidationInterfaceQueue()
               LOG_EVENT(fmt, local_name, __VA_ARGS__);           \
  +            UninterruptibleSleep(45ms); \
               event();                                           \
  diff --git a/test/functional/interface_zmq.py b/test/functional/interface_zmq.py
  index 6717007..eee377daea 100755
  --- a/test/functional/interface_zmq.py
  +++ b/test/functional/interface_zmq.py
  @@ -176,3 +176,3 @@ class ZMQTest (BitcoinTestFramework):
           for sub in subscribers:
  -            sub.socket.set(zmq.RCVTIMEO, recv_timeout*1000)
  +            sub.socket.set(zmq.RCVTIMEO, int(recv_timeout * 1000))

  @@ -271,3 +271,3 @@ class ZMQTest (BitcoinTestFramework):
               [(topic, address) for topic in ["hashblock", "hashtx"]],
  -            recv_timeout=2)  # 2 second timeout to check end of notifications
  +            recv_timeout=0.2)  # 2 second timeout to check end of notifications
           self.disconnect_nodes(0, 1)
  ```

  Before this pull: Test fails with `zmq.error.Again: Resource temporarily unavailable`

  After this pull: Test passes

ACKs for top commit:
  l0rinc:
    code review ACK fa48f8c
  achow101:
    ACK fa48f8c

Tree-SHA512: 5ff8bdd807ff4b644daa634bb7b469da3da3915f58afba63a90e662df99cbebc86636e34e2b1b313c8629773aef2a239fb3025226a84d2ec22f6ecd4cea666c4

Author: achow101

test/functional/interface_zmq.py

@@ -174,7 +174,7 @@ def setup_zmq_test(self, services, *, recv_timeout=60, sync_blocks=True, ipv6=Fa
 
         # set subscriber's desired timeout for the test
         for sub in subscribers:
-            sub.socket.set(zmq.RCVTIMEO, recv_timeout*1000)
+            sub.socket.set(zmq.RCVTIMEO, int(recv_timeout * self.options.timeout_factor * 1000))
 
         self.connect_nodes(0, 1)
         if sync_blocks: