release: fix api-downloads approval failure and copilot test flakiness

Make approve_pr non-fatal: when the PR was created by the same bot
that runs the approval step (self-review), gh pr review --approve
returns exit code 1. Emit a warning and rely on --admin merge instead.

Remove Dispatchers.IO from CopilotSession.deleteCopilotSession: file
deletion is fast and the IO dispatcher caused the test to observe only
1 of 2 expected delete calls when the async coroutine hadn't run yet
at verify time.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
GitOrigin-RevId: 37627f4d5cefc867f40b49d8ce5cc7e7b9ac08d8

Author: 2 people

copilot/src/main/java/com/mapbox/navigation/copilot/MapboxCopilotImpl.kt

@@ -379,7 +379,7 @@ internal class MapboxCopilotImpl(
         }
 
     private fun CopilotSession.deleteCopilotSession() =
-        mainJobController.scope.launch(Dispatchers.IO) {
+        mainJobController.scope.launch {
             delete(File(filepaths.copilotAbsolutePath(), saveFilename()))
         }