[wifi_info] Add entity_category diagnostic to IP address sensor

[bharvey88]

What does this implement/fix?

Adds entity_category: "diagnostic" to the wifi_info IP address text sensor in Core.yaml.

This was missing from the original implementation — without it the IP address sensor appears in the main entity list rather than being grouped under Diagnostics in Home Assistant.

Types of changes

• Bugfix (fixed change that fixes an issue)

Checklist:

• The code change has been tested and works locally

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📥 Commits

Reviewing files that changed from the base of the PR and between 013c30f and 388be41.

📒 Files selected for processing (1)

• Integrations/ESPHome/Core.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch wifi-ip-diagnostic-category

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