Log pending task counts before shutdown join/detach

Restores visibility into dropped work that was lost when the old
LOG_WARN on non-empty queues was removed.  Logs queue sizes before
the join/detach decision so operators can see pending tasks in both
code paths.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bmehta001

lib/pal/WorkerThread.cpp

@@ -53,6 +53,14 @@ namespace PAL_NS_BEGIN {
 
         void Join() final
         {
+            // Log pending work before shutdown so operators can see if
+            // tasks are being dropped.
+            if (!m_queue.empty()) {
+                LOG_WARN("Shutdown with %zu queued task(s) pending", m_queue.size());
+            }
+            if (!m_timerQueue.empty()) {
+                LOG_WARN("Shutdown with %zu timer(s) pending", m_timerQueue.size());
+            }
             auto item = new WorkerThreadShutdownItem();
             Queue(item);
             std::thread::id this_id = std::this_thread::get_id();