Add AirGradient measurement interval select

[samuelbles07]

Breaking change

None.

Proposed change

Add a measurement interval configuration select for AirGradient Go devices. The select exposes the curated intervals supported by the device firmware, from 3 seconds through 1 hour.

Validation

• uv run --no-sync pytest tests/components/airgradient --cov=homeassistant.components.airgradient --cov-report=term-missing (85 passed, 174 snapshots, 100% coverage)
• Changed-file prek checks passed, including hassfest.

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: N/A
• This PR is related to issue: N/A
• Link to documentation pull request: N/A
• Link to developer documentation pull request: N/A
• Link to frontend pull request: N/A

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running: python3 -m script.gen_requirements_all.
• For the updated dependencies a diff between library versions and ideally a link to the changelog/release notes is added to the PR description.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[home-assistant]

Hey there @airgradienthq, @joostlek, mind taking a look at this pull request as it has been labeled with an integration (airgradient) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

Adds a configuration select for supported AirGradient Go measurement intervals.

Changes:

• Defines supported interval options and device capability.
• Adds localized labels.
• Covers entity metadata and writes with tests.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
homeassistant/components/airgradient/const.py	Adds the Go capability.
homeassistant/components/airgradient/select.py	Implements the interval select.
homeassistant/components/airgradient/strings.json	Adds option translations.
tests/components/airgradient/test_select.py	Tests interval writes.
tests/components/airgradient/snapshots/test_select.ambr	Records entity state and metadata.

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[justanotherariel]

Shouldn't this be a number entity instead? The API can report any number in between too, so we need to make sure to at least handle this too.

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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