chore: [SDK-4213] route consumer call-sites through serial IO (part 3/3)

[abdulraqeeb33]

Summary

Part 3 of 3 (final) of the SDK-4213 stack. Stacked on #2673 — review/merge last.

Updates the feature-flag consumers to the unconditional async API:

• BackgroundManager focus/unfocus, SessionService, NotificationsManager, NotificationPermissionController polling, and OneSignalCrashUploaderWrapper dispatch through the serial IO helper so lifecycle/Binder work never runs inline on the main thread.
• Updates corresponding tests; strips stale ticket references from comments.

The tip of this PR reproduces the original ar/sdk-4213 net diff exactly.

Test plan

• CI green
• consumer + notifications unit tests pass

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📊 Diff Coverage Report

Diff Coverage Report (Changed Lines Only)

Gate: aggregate coverage on changed executable lines must be ≥ 80% (JaCoCo line data for lines touched in the diff).

Changed Files Coverage

• BackgroundManager.kt: 2/2 touched executable lines (100.0%) (4 touched lines in diff)
• OneSignalCrashUploaderWrapper.kt: 0/3 touched executable lines (0.0%) (3 touched lines in diff)
  • 3 uncovered touched lines in this file
• SessionService.kt: 2/2 touched executable lines (100.0%) (5 touched lines in diff)
• NotificationsManager.kt: 0/1 touched executable lines (0.0%) (2 touched lines in diff)
  • 1 uncovered touched lines in this file
• NotificationPermissionController.kt: 0/2 touched executable lines (0.0%) (3 touched lines in diff)
  • 2 uncovered touched lines in this file

Overall (aggregate gate)

4/10 touched executable lines covered (40.0% — requires ≥ 80%)

Per-file detail (informational; gate is aggregate above):

• OneSignalCrashUploaderWrapper.kt: 0.0% (3 uncovered touched lines)

• NotificationsManager.kt: 0.0% (1 uncovered touched lines)

• NotificationPermissionController.kt: 0.0% (2 uncovered touched lines)

❌ Coverage Check Failed

Aggregate coverage on touched lines is 40.0% (minimum 80%).

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