Remove _attr_icon from existing entities

[puddly]

These will be moved to Core:

diff --git a/homeassistant/components/zha/icons.json b/homeassistant/components/zha/icons.json
index 9b060e8105a..8dc370a6e52 100644
--- a/homeassistant/components/zha/icons.json
+++ b/homeassistant/components/zha/icons.json
@@ -86,6 +86,18 @@
       },
       "presence_detection_timeout": {
         "default": "mdi:timer-edit"
+      },
+      "exercise_trigger_time": {
+        "default": "mdi:clock"
+      },
+      "external_temperature_sensor": {
+        "default": "mdi:thermometer"
+      },
+      "load_room_mean": {
+        "default": "mdi:scale-balance"
+      },
+      "regulation_setpoint_offset": {
+        "default": "mdi:thermostat"
       }
     },
     "select": {
@@ -94,6 +106,9 @@
       },
       "keypad_lockout": {
         "default": "mdi:lock"
+      },
+      "exercise_day_of_week": {
+        "default": "mdi:wrench-clock"
       }
     },
     "sensor": {
@@ -132,6 +147,15 @@
       },
       "hooks_state": {
         "default": "mdi:hook"
+      },
+      "open_window_detected": {
+        "default": "mdi:window-open"
+      },
+      "load_estimate": {
+        "default": "mdi:scale-balance"
+      },
+      "preheat_time": {
+        "default": "mdi:radiator"
       }
     },
     "switch": {
@@ -158,6 +182,21 @@
       },
       "hooks_locked": {
         "default": "mdi:lock"
+      },
+      "external_window_sensor": {
+        "default": "mdi:window-open"
+      },
+      "use_internal_window_detection": {
+        "default": "mdi:window-open"
+      },
+      "prioritize_external_temperature_sensor": {
+        "default": "mdi:thermometer"
+      },
+      "heat_available": {
+        "default": "mdi:water-boiler"
+      },
+      "use_load_balancing": {
+        "default": "mdi:scale-balance"
       }
     }
   },

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.78%. Comparing base (c516144) to head (af41a36).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #175      +/-   ##
==========================================
- Coverage   95.79%   95.78%   -0.01%     
==========================================
  Files          61       61              
  Lines        9324     9311      -13     
==========================================
- Hits         8932     8919      -13     
  Misses        392      392              

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