WebHost: fix gen timeout/exception resource handling (#5540)

* WebHost: reset Generator proc title on error

* WebHost: fix shutting down autogen

This is still not perfect but solves some of the issues.

* WebHost: properly propagate JOB_TIME

* WebHost: handle autogen shutdown

test/utils/test_daemon_thread_pool.py

@@ -0,0 +1,14 @@
+import unittest
+
+from Utils import DaemonThreadPoolExecutor
+
+
+class DaemonThreadPoolExecutorTest(unittest.TestCase):
+    def test_is_daemon(self) -> None:
+        def run() -> None:
+            pass
+
+        with DaemonThreadPoolExecutor(1) as executor:
+            executor.submit(run)
+
+            self.assertTrue(next(iter(executor._threads)).daemon)