Add blog post for TemperatureConverter.convert_interval deprecation

[krahabb]

Proposed change

Type of change

• Document existing features within Home Assistant
• Document new or changing features for which there is an existing pull request elsewhere
• Spelling or grammatical corrections, or rewording for improved clarity
• Changes to the backend of this documentation
• Remove stale or deprecated documentation

Checklist

• I have read and followed the documentation guidelines.
• I have verified that my changes render correctly in the documentation.

Additional information

• This PR fixes or closes issue: fixes #
• Link to relevant existing code or pull request: core PR 155689

Summary by CodeRabbit

• Documentation
  • Added deprecation notice for temperature interval conversion functionality, recommending migration to the new converter approach.

[coderabbitai]

📝 Walkthrough

Walkthrough

A new blog post documenting the deprecation of TemperatureConverter.convert_interval for temperature interval conversions, recommending the use of TemperatureDeltaConverter.convert and the new device class as replacements.

Changes

Cohort / File(s)	Summary
Blog Documentation blog/2025-11-04-convert-interval-deprecation.md	New blog post with front-matter metadata documenting the deprecation of TemperatureConverter.convert_interval and promoting TemperatureDeltaConverter.convert as the preferred alternative; references related core PRs.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Pre-merge checks and finishing touches

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description follows the repository template and includes the required type of change selection and links to the relevant core PR, though the Proposed change section is empty.
Title check	✅ Passed	The title directly and clearly summarizes the main change: adding a blog post documenting the deprecation of TemperatureConverter.convert_interval.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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