Only process logbook timestamps for events we will keep (#36792)

* Only process logbook timestamps for events we will keep

Since we group by minute we were previously processing
every timestamp. We can avoid this by making all the
minute checks use the unprocessed datetime since
the groupings will be the same regardless of timezone.

This reduces the number of datetime object recreations
by at least an order of magnitude.

tests/components/alexa/test_init.py

@@ -1,9 +1,10 @@
 """Tests for alexa."""
 from homeassistant.components import logbook
 from homeassistant.components.alexa.const import EVENT_ALEXA_SMART_HOME
-import homeassistant.core as ha
 from homeassistant.setup import async_setup_component
 
+from tests.components.logbook.test_init import MockLazyEventPartialState
+
 
 async def test_humanify_alexa_event(hass):
     """Test humanifying Alexa event."""
@@ -14,11 +15,11 @@ async def test_humanify_alexa_event(hass):
         logbook.humanify(
             hass,
             [
-                ha.Event(
+                MockLazyEventPartialState(
                     EVENT_ALEXA_SMART_HOME,
                     {"request": {"namespace": "Alexa.Discovery", "name": "Discover"}},
                 ),
-                ha.Event(
+                MockLazyEventPartialState(
                     EVENT_ALEXA_SMART_HOME,
                     {
                         "request": {
@@ -28,7 +29,7 @@ async def test_humanify_alexa_event(hass):
                         }
                     },
                 ),
-                ha.Event(
+                MockLazyEventPartialState(
                     EVENT_ALEXA_SMART_HOME,
                     {
                         "request": {