remove watchdog timers and specific asyncio implementations

Watchdog timers have been removed. They were introduced in 0.0.72 to help
diagnose pipeline freezes. Unfortunately, they proved ineffective since they
required developers to use Pipecat-specific queues, iterators, and events to
correctly reset the timer, which limited their usefulness and added friction.

tests/test_watchdog_queue.py

@@ -1,65 +0,0 @@
-#
-# Copyright (c) 2024-2025 Daily
-#
-# SPDX-License-Identifier: BSD 2-Clause License
-#
-
-import asyncio
-import unittest
-
-from pipecat.utils.asyncio.task_manager import TaskManager
-from pipecat.utils.asyncio.watchdog_priority_queue import WatchdogPriorityQueue
-from pipecat.utils.asyncio.watchdog_queue import WatchdogQueue
-
-
-class TestWatchdogQueue(unittest.IsolatedAsyncioTestCase):
-    async def test_simple_item(self):
-        queue = WatchdogQueue(TaskManager())
-        await queue.put(1)
-        await queue.put(2)
-        await queue.put(3)
-        self.assertEqual(await queue.get(), 1)
-        queue.task_done()
-        self.assertEqual(await queue.get(), 2)
-        queue.task_done()
-        self.assertEqual(await queue.get(), 3)
-        queue.task_done()
-
-    async def test_watchdog_sentinel(self):
-        queue = WatchdogQueue(TaskManager())
-        await queue.put(1)
-        self.assertEqual(await queue.get(), 1)
-        queue.task_done()
-        # The get should throw an exception.
-        queue.cancel()
-        try:
-            await queue.get()
-            assert False
-        except asyncio.CancelledError:
-            assert True
-
-
-class TestWatchdogPriorityQueue(unittest.IsolatedAsyncioTestCase):
-    async def test_simple_item(self):
-        queue = WatchdogPriorityQueue(TaskManager(), tuple_size=2)
-        await queue.put((3, 1))
-        await queue.put((2, 1))
-        await queue.put((1, 1))
-        self.assertEqual(await queue.get(), (1, 1))
-        queue.task_done()
-        self.assertEqual(await queue.get(), (2, 1))
-        queue.task_done()
-        self.assertEqual(await queue.get(), (3, 1))
-        queue.task_done()
-
-    async def test_watchdog_sentinel(self):
-        queue = WatchdogPriorityQueue(TaskManager(), tuple_size=2)
-        await queue.put((0, 1))
-        # The get should throw an exception because the watchdog sentinel has
-        # higher priority.
-        queue.cancel()
-        try:
-            await queue.get()
-            assert False
-        except asyncio.CancelledError:
-            assert True