Add notification_icon_color to supported keys on Android

[inukiwi]

PR to accompany the change in home-assistant/android#7091

[Copilot]

Pull request overview

This PR updates the Android v1 FCM payload builder to support the new notification_icon_color data key, aligning this service with the companion Android app change that treats notification_icon_color as the preferred alias for color.

Changes:

• Add notification_icon_color to the allowlist of Android notification-related data keys forwarded into the FCM data payload.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.43%. Comparing base (5615e56) to head (c5c85c6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #328   +/-   ##
=======================================
  Coverage   79.43%   79.43%           
=======================================
  Files          10       10           
  Lines         642      642           
  Branches      207      207           
=======================================
  Hits          510      510           
  Misses        113      113           
  Partials       19       19           

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[jpelgrom]

Android PR is merged