Improve Plex debounce/throttle logic (#33805)

* Improve Plex debounce/throttle logic

* Use Debouncer helper, rewrite affected tests

* Mock storage so files aren't left behind

* Don't bother with wrapper method, store debouncer call during init

* Test cleanup from review

* Don't patch own code in tests

tests/components/plex/test_config_flow.py

@@ -15,13 +15,14 @@ from homeassistant.components.plex.const import (
     CONF_USE_EPISODE_ART,
     DOMAIN,
     PLEX_SERVER_CONFIG,
+    PLEX_UPDATE_PLATFORMS_SIGNAL,
     SERVERS,
 )
 from homeassistant.config_entries import ENTRY_STATE_LOADED
 from homeassistant.const import CONF_HOST, CONF_PORT, CONF_TOKEN, CONF_URL
+from homeassistant.helpers.dispatcher import async_dispatcher_send
 from homeassistant.setup import async_setup_component
 
-from .common import trigger_plex_update
 from .const import DEFAULT_DATA, DEFAULT_OPTIONS, MOCK_SERVERS, MOCK_TOKEN
 from .mock_classes import MockPlexAccount, MockPlexServer
 
@@ -415,7 +416,8 @@ async def test_option_flow_new_users_available(hass, caplog):
 
     server_id = mock_plex_server.machineIdentifier
 
-    await trigger_plex_update(hass, server_id)
+    async_dispatcher_send(hass, PLEX_UPDATE_PLATFORMS_SIGNAL.format(server_id))
+    await hass.async_block_till_done()
 
     monitored_users = hass.data[DOMAIN][SERVERS][server_id].option_monitored_users