Remove calendar and todo from unconditionally loaded integrations (#166951)

Co-authored-by: Artur Pragacz <49985303+arturpragacz@users.noreply.github.com>

homeassistant/bootstrap.py

@@ -238,7 +238,9 @@ DEFAULT_INTEGRATIONS = {
     "timer",
     #
     # Base platforms:
-    *BASE_PLATFORMS,
+    # Note: Calendar and todo are not included to prevent them from registering
+    # their frontend panels when there are no calendar or todo integrations.
+    *(BASE_PLATFORMS - {"calendar", "todo"}),
     #
     # Integrations providing triggers and conditions for base platforms:
     "air_quality",

tests/snapshots/test_bootstrap.ambr

@@ -19,7 +19,6 @@
     'blueprint',
     'brands',
     'button',
-    'calendar',
     'camera',
     'climate',
     'config',
@@ -94,7 +93,6 @@
     'text',
     'time',
     'timer',
-    'todo',
     'trace',
     'tts',
     'update',
@@ -129,7 +127,6 @@
     'blueprint',
     'brands',
     'button',
-    'calendar',
     'camera',
     'climate',
     'config',
@@ -203,7 +200,6 @@
     'text',
     'time',
     'timer',
-    'todo',
     'trace',
     'tts',
     'update',