Fix unhandled exception with Guardian paired sensor coordinators

[bachya]

Proposed change

Guardian was maintaining a rather unwieldly dict of DataUpdateCoordinator objects: most keys contained a single coordinator, but one key (related to paired sensor status) contained a dict of coordinator objects. This previously went unnoticed because, until recently, the Guardian integration was not strongly typed.

Valve controller entities were looking at their aggregated coordinators to determine their available property; the presence of a dict could throw an unhandled exception. This PR fixes things by storing paired sensor coordinators separately from the other coordinators.

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)
• 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 Traceback will setting up guardian on 2021.8b0 #53651
• This PR is related to issue: N/A
• Link to documentation pull request: N/A

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[bdraco]

Confirmed fixed 👍