test: drop thread-sanitizer suppressions

- every entry stood in for a library tsan could not see into; with libzmq,
  libsodium and libstdc++ now tsan-instrumented in the tsan CI job, the
  happens-before edges they establish are visible and nothing is left to
  suppress
- suppressions were blunt (a race: entry matches any frame in the stack),
  so they could also mask real races passing through those frames

.github/workflows/ci.yml

@@ -68,8 +68,6 @@ jobs:
     if: github.repository == 'FairRootGroup/FairMQ'
     name: ${{ matrix.sanitizer.name }}
     runs-on: ubuntu-24.04
-    env:
-      TSAN_OPTIONS: suppressions=${{ github.workspace }}/test/thread_sanitizer_suppressions.txt
     strategy:
       fail-fast: false
       matrix:

test/thread_sanitizer_suppressions.txt

@@ -1,32 +0,0 @@
-# ThreadSanitizer suppressions for FairMQ.
-#
-# libzmq is not built with -fsanitize=thread, so tsan cannot observe the
-# happens-before that its inproc/socket queues establish between the user
-# threads and libzmq's I/O threads. This produces false-positive data races
-# on message buffers handed across that boundary. The proper fix is to build
-# libzmq with tsan as well; until then these races are suppressed.
-
-# Racy access made directly from libzmq (encoder/decoder memcpy,
-# signaler/epoll, recv).
-called_from_lib:libzmq.so
-
-# Zero-copy message deleters that libzmq runs from msg_t::close once it is
-# done with a buffer; the happens-before with the buffer's producer runs
-# through libzmq's queue.
-race:zmq::msg_t::close
-race:fair::mq::TransportFactory::SimpleMsgCleanup
-
-# shmem message metadata read on the user side after delivery through libzmq
-# (the shmem transport ships its metadata over a zeromq channel).
-race:fair::mq::shmem::Message::Message
-race:fair::mq::shmem::Socket::Receive
-race:fair::mq::shmem::ShmHeader
-
-# Multipart message buffers written by the sending thread and read back by the
-# receiving thread after delivery through libzmq's inproc queue; the
-# happens-before runs through that non-instrumented queue.
-race:RunMultiThreadedMultipart
-
-# std::regex / std::locale facet lazy-init races inside libstdc++.
-race:fair::mq::Channel::Validate
-race:fair::mq::tools::ToString