[ci-scan-net11] Android SafeArea keyboard resize assertions fail in UI tests

## Summary
The Android SafeArea UI test repeatedly reports that the content grid does not shrink when the keyboard appears.

## Build Information
- **Pipeline**: maui-pr-uitests
- **Build**: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1554813
- **Build ID**: 1554813
- **Branch**: net11.0
- **First seen**: 2026-08-12
- **Occurrences**: 10 in last 10 builds

## Affected Legs
- Controls SafeAreaEdges / Android API 36 / Pixel 3 XL

## Error Message
```text
2026-08-16T16:38:41.9965788Z 1) ContentGrid should shrink when keyboard is showing with SafeAreaEdges=All
2026-08-16T16:38:41.9966349Z Expected: less than 2705
2026-08-16T16:38:41.9966486Z But was: 2705
```

## Recommended Action
Investigate keyboard-driven SafeArea relayout on Android and the assertions in `src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue28986_ContentPage.cs`; verify the content grid is remeasured after keyboard visibility and SafeAreaEdges changes.

Start with src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue28986_ContentPage.cs and reproduce the SafeArea UI test from the maui-pr-uitests Android API 36 failure. Trace the keyboard visibility and SafeAreaEdges changes around the content-grid assertions. Done means the content grid is remeasured after those changes and the affected assertions pass on the Android test leg.

Written by the indexing model from the issue text.