Coinbase code quality improvements from review (#52307)

* Fix breaking loop if single bad currency

* Remove unneeded update

* Reduce executor calls and use helper

* Avoid setting up integration when not needed in test

* Remove defunct info from strings

* Move already configured check

* Move instance update out of data class init

homeassistant/components/coinbase/sensor.py

@@ -36,7 +36,6 @@ ATTRIBUTION = "Data provided by coinbase.com"
 async def async_setup_entry(hass, config_entry, async_add_entities):
     """Set up Coinbase sensor platform."""
     instance = hass.data[DOMAIN][config_entry.entry_id]
-    hass.async_add_executor_job(instance.update)
 
     entities = []
 
@@ -58,7 +57,7 @@ async def async_setup_entry(hass, config_entry, async_add_entities):
                 "your settings in Coinbase's developer tools",
                 currency,
             )
-            break
+            continue
         entities.append(AccountSensor(instance, currency))
 
     if CONF_EXCHANGE_RATES in config_entry.options: