Improve user experience when enabling a disabled entity

[emontnemery]

Proposed change

Improve user experience when enabled a disabled entity:

• Some entities won't be enabled until HA is restarted
• Entities won't be enabled until after a long delay

Backend PR: home-assistant/core#42667

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[emontnemery]

I've added popups in the three places where updateEntityRegistryEntry is called to enable disabled entities.

There are also calls from:

• ha-config-device-page
  Only entity_id and name are modified here, so the check is not needed
• ha-config-entities
  Popups added when enabling entitied, but not when they are disabled.
• zha-device-card
  ZHA supports unload, so the check is not needed.