Check if Google Assistant is linked

[bramkragten]

Proposed change

Requires home-assistant/core#48260

Not linked:

Linked:

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

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

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

[balloob]

Nice!

We also trigger a sync when people change their exposed entities. That is not covered by this PR yet.

Also thinking here, we now disable it when we get a 404, but maybe that should happen on the backend? We disable it until the user requests a Sync.

We also keep track of synced users in Google in the backend, wonder if we should pull in that data here?