Fix(android): Ensure UI updater task is stopped before modifying view hierarchy

[seer-by-sentry]

Fixes ANDROID-SYMBOL-COLLECTOR-MOBILE-6T. The issue was that: Aggressive UI updates and view visibility changes race with Android's Accessibility Service traversing the view hierarchy, causing concurrent modification and ArrayIndexOutOfBoundsException.

• Prevents race conditions with Android's Accessibility Service when modifying the view hierarchy after an upload task completes or is cancelled.
• Ensures the UI updater task is fully stopped before modifying the view hierarchy by awaiting it after cancellation.

This fix was generated by Seer in Sentry, triggered by bruno@sentry.io. 👁️ Run ID: 2529000

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.11%. Comparing base (7b4e4d9) to head (747e886).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #246      +/-   ##
==========================================
- Coverage   51.26%   51.11%   -0.15%     
==========================================
  Files          27       27              
  Lines        1348     1348              
  Branches      105      105              
==========================================
- Hits          691      689       -2     
- Misses        623      625       +2     
  Partials       34       34              

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