common: enable ha_time in common packages, devices extend it

Move the homeassistant time platform (id ha_time) into all common
packages. Devices with custom triggers now use '!extend ha_time';
plain duplicate time blocks are removed. mcu-lvgl's unused time_comp
is unified to ha_time.

mcu-heater.yaml

@@ -129,9 +129,7 @@ globals:
     initial_value: '20.5'
 
 time:
-  - platform: homeassistant
-    id: ha_time
-    timezone: Europe/Bratislava
+  - id: !extend ha_time
     on_time:
       - seconds: 0
         minutes: /1