Cleanup async handling (#6388)

* Cleanups unneeded blocks

* Cleanup bootstrap

* dedicated update_ha_state

* Fix imap_email_content

* fx tests

* Fix lint & spell

homeassistant/bootstrap.py

@@ -55,6 +55,9 @@ def async_setup_component(hass: core.HomeAssistant, domain: str,
 
     This method is a coroutine.
     """
+    if domain in hass.config.components:
+        return True
+
     setup_tasks = hass.data.get(DATA_SETUP)
 
     if setup_tasks is not None and domain in setup_tasks:
@@ -211,6 +214,10 @@ def _async_setup_component(hass: core.HomeAssistant,
 
     hass.config.components.add(component.DOMAIN)
 
+    # cleanup
+    if domain in hass.data[DATA_SETUP]:
+        hass.data[DATA_SETUP].pop(domain)
+
     hass.bus.async_fire(
         EVENT_COMPONENT_LOADED, {ATTR_COMPONENT: component.DOMAIN}
     )