fix(join, threadpool): MCOL-5565: MCOL-5636: MCOL-5645: port from develop-23.02 to [develop] (#3128)

* fix(threadpool): MCOL-5565 queries stuck in FairThreadScheduler. (#3100)

Meta Primitive Jobs, .e.g ADD_JOINER, LAST_JOINER stuck
	in Fair scheduler without out-of-band scheduler. Add OOB
	scheduler back to remedy the issue.

* fix(messageqcpp): MCOL-5636 same node communication crashes transmiting PP errors to EM b/c error messaging leveraged socket that was a nullptr. (#3106)

* fix(threadpool): MCOL-5645 errenous threadpool Job ctor implictly sets socket shared_ptr to nullptr causing sigabrt when threadpool returns an error (#3125)

---------

Co-authored-by: drrtuy <roman.nozdrin@mariadb.com>

utils/messageqcpp/samenodepseudosocket.cpp

@@ -0,0 +1,127 @@
+/* Copyright (C) 2024 MariaDB Corp.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; version 2 of
+   the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA. */
+
+#include <string>
+
+#include "samenodepseudosocket.h"
+#include "iosocket.h"
+
+namespace messageqcpp
+{
+SameNodePseudoSocket::SameNodePseudoSocket(joblist::DistributedEngineComm* exeMgrDecPtr) : dec_(exeMgrDecPtr)
+{
+  assert(dec_);
+}
+
+SameNodePseudoSocket::~SameNodePseudoSocket()
+{
+}
+
+void SameNodePseudoSocket::open()
+{
+}
+
+void SameNodePseudoSocket::close()
+{
+}
+
+Socket* SameNodePseudoSocket::clone() const
+{
+  return nullptr;
+}
+
+SameNodePseudoSocket::SameNodePseudoSocket(const SameNodePseudoSocket& rhs)
+{
+}
+
+SameNodePseudoSocket& SameNodePseudoSocket::operator=(const SameNodePseudoSocket& rhs)
+{
+  return *this;
+}
+
+const SBS SameNodePseudoSocket::read(const struct ::timespec* timeout, bool* isTimeOut, Stats* stats) const
+{
+  return nullptr;
+}
+
+// This is the only working method of this class. It puts SBS directly into DEC queue.
+void SameNodePseudoSocket::write(SBS msg, Stats* stats)
+{
+  dec_->addDataToOutput(msg);
+}
+
+void SameNodePseudoSocket::write(const ByteStream& msg, Stats* stats)
+{
+}
+
+void SameNodePseudoSocket::write_raw(const ByteStream& msg, Stats* stats) const
+{
+}
+
+void SameNodePseudoSocket::connect(const sockaddr* serv_addr)
+{
+}
+
+void SameNodePseudoSocket::bind(const sockaddr* serv_addr)
+{
+}
+
+const IOSocket SameNodePseudoSocket::accept(const struct timespec* timeout)
+{
+  return IOSocket();
+}
+
+void SameNodePseudoSocket::listen(int backlog)
+{
+}
+
+const std::string SameNodePseudoSocket::toString() const
+{
+  return "";
+}
+
+const std::string SameNodePseudoSocket::addr2String() const
+{
+  return "";
+}
+
+bool SameNodePseudoSocket::isSameAddr(const Socket* rhs) const
+{
+  return false;
+}
+
+bool SameNodePseudoSocket::isSameAddr(const struct in_addr& ipv4Addr) const
+{
+  return false;
+}
+
+int SameNodePseudoSocket::ping(const std::string& ipaddr, const struct timespec* timeout)
+{
+  return 0;
+}
+
+bool SameNodePseudoSocket::isConnected() const
+{
+  return true;
+}
+
+bool SameNodePseudoSocket::hasData() const
+{
+  return false;
+}
+
+}  // namespace messageqcpp