Fix Matter climate platform attributes when dedicated OnOff attribute is off

[marcelveldt]

Proposed change

Fix a small oversight/edgecase in the Matter climate platform code that parses the state attribute from the the node state.
When a climate device has a dedicated Power switch and that turned off at startup, none of the mandatory attributes are parsed. This PR fixes it and will only override the hvac_mode and hvac_action if that is the case but still parse the temperature attributes

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 Matter Thermoset not available after restart of Home Assistant until status change #126073 fixes Can't add Nest thermostat via Matter #124932
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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[home-assistant]

Hey there @home-assistant/matter, mind taking a look at this pull request as it has been labeled with an integration (matter) you are listed as a code owner for? Thanks!

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[mkkm2112]

I am very much of a noob @marcelveldt - can you pls tell me what this means? Does this mean there a quick update coming for the Matter integration which will address the unavailable state on my thermostats?