The HTTP Urgency header set on WebPush requests is not exposed to
UnifiedPush Android clients by the connector library. Include a
"priority" field ("high" or "normal") directly in the JSON body
so that clients can determine whether a push notification requires
immediate wake-up processing or can be deferred until the next
natural activity.
This complements the daemon-side priority assignment (Gerrit #34059)
and allows UnifiedPush (F-Droid) builds to benefit from the same
battery savings as FCM builds.
Change-Id: Id316ff89e64e59d1b224f5b4e14da6b36dc62c95
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>