Send wide events to a dedicated POST endpoint

[lmac012]

Task/Issue URL: https://app.asana.com/1/137249556945/project/488551667048375/task/1212546442226307?focus=truefocus=true

Description

Steps to test this PR

• Remove .debug suffix from application ID to enable testing subscriptions OR apply staging patch
• Purchase test subscription
• Verify in logcat that pixels with wide_ prefix are sent, for example wide_auth-token-refresh.* or wide_subscription-purchase.*
• Verify that whenever wide event pixel is sent, the app also makes POST request to improving.duckduckgo.com/e, with payload containing data matching the pixel.

No UI changes

---

Note

Add API-based wide event delivery and delegate between API/pixel via feature toggles; update processing to use new repo queries and schedule retries.

• Wide events transport:
  • Add ApiWideEventSender using WideEventService (POST ${AppUrl.Url.PIXEL}/e) with request models (WideEventRequest, GlobalSection, AppSection, FeatureSection, FeatureData, ContextSection).
  • Introduce DelegatingWideEventSender to route to api and/or pixel senders based on wideEvents toggles (sendWideEventsViaPost, sendWideEventsViaPixels).
  • Extract PixelWideEventSender and keep pixel param removal plugin; no functional change noted.
• Processing:
  • CompletedWideEventsProcessor now listens to hasCompletedWideEvents() and processes IDs via getCompletedWideEventIds() in mutex-guarded chunks; on failure, schedules a retry CompletedWideEventsWorker with network constraint.
• Persistence:
  • WideEventDao/Repository: add getCompletedWideEventIds() (suspend) and hasCompletedWideEvents(): Flow<Boolean>; remove/combine previous flow API.
• Feature toggles:
  • Add sendWideEventsViaPixels and sendWideEventsViaPost to WideEventFeature (defaults TRUE and INTERNAL respectively).
• Tests:
  • Add ApiWideEventSenderTest, CompletedWideEventsProcessorTest; update WideEventRepositoryTest for new APIs.

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[lmac012]

• Send wide events to a dedicated POST endpoint #7422 👈 (View in Graphite)
• develop

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