Add last_sensor_update field to FYTA integration

[dontinelli]

Proposed change

Update documentation for new feature

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Add new sensor for fyta core#180328
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

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[Copilot]

Pull request overview

Updates the FYTA integration documentation to reflect a new diagnostic sensor added in Home Assistant Core (last_sensor_update), so readers can see it listed among the available per-plant sensors.

Changes:

• Adds the last_sensor_update sensor to the FYTA sensors table.

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