Add Total Volatile Organic Compounds (tVOC) matter discovery schema

[kibergus]

Proposed change

Adds a little bit of missing configuration to propagate tVOC readings from a Matter device to Home Assistant. Without this patch tVOC readings are ignored. Tested with SenseCAP indicator with indicator-matter firmware.

NOTE: Device needs to be deleted and re-added for the sensor to appear.

If this pull request is not of adequate quality, please consider this to be a feature request to add tVOC sensor to matter integration.

Type of change

• New feature (which adds functionality to an existing integration)

Additional information

This change would also be needed for #105567

Checklist

• The code change is tested and works locally.
  • YES
• Local tests pass. Your PR cannot be merged unless tests pass
  • I am not familiar with HA code ecosystem enough to run tests. But the change is trivial and mechanic. I expect tests to pass.
• There is no commented out code in this PR.
  • No commented out code.
• I have followed the [development checklist][dev-checklist]
  • I have not read it.
• I have followed the [perfect PR recommendations][perfect-pr]
  • I have not read it.
• The code has been formatted using Ruff (ruff format homeassistant tests)
  • No, I don't have this installed. But formatting matches other entries in the file.
• Tests have been added to verify that the new code works.
  • No.

To help with the load of incoming pull requests:

• I have reviewed two other [open pull requests][prs] in this repository.
  • No.

[home-assistant]

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[home-assistant]

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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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Stale

[marcelveldt]

Thanks for the contribution! The discovery schema looks fine, thanks!
Only thing missing is a test. Just add a fixture from a device that includes this cluster/attribute (may also be a mocked device). See the other tests for examples.

[marcelveldt]

A recently added fixture also contained the tVOC measurement so I have just added a test.