Matching duplicate named entities is now an error in Assist

[synesthesiam]

Breaking change

Proposed change

Targeting entities with the same name or alias is now an error in Assist, resulting in an error like "Sorry, there are multiple devices named overhead light". If the entities are in different areas, they can still be targeted ("turn on overhead light in the bedroom"). This avoids the previous behavior where one of the entities would be targeted, depending on its position in HA's state machine.

This PR also completes the fix for issue: #109868

Type of change

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

Additional information

• This PR fixes or closes issue: fixes # When an intent requires a name and an area, we do not search for the name in the area, we search the name globally. #109868
• This PR is related to issue:
• Link to documentation pull request:

Checklist

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