[ci-scan] Android SafeArea keyboard test does not shrink ContentGrid

## Summary
`SafeAreaNoWhiteSpaceAfterKeyboardDismissAndEdgeToggle` repeatedly reports that the Android ContentGrid does not shrink when the keyboard appears.

## Build Information
- **Pipeline**: maui-pr-uitests
- **Build**: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1554582
- **Build ID**: 1554582
- **Branch**: main
- **First seen**: 2026-08-10
- **Occurrences**: 4 in last 10 builds

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

## Error Message
```
2026-08-15T21:55:48.2187319Z 1) ContentGrid should shrink when keyboard is showing with SafeAreaEdges=All
```

## Recommended Action
Investigate Android safe-area and soft-input resizing exercised by `Issue28986_ContentPage.SafeAreaNoWhiteSpaceAfterKeyboardDismissAndEdgeToggle`, focusing on why the measured ContentGrid height remains unchanged after the keyboard opens.

Start with the maui-pr-uitests failure from build 1554582 and the `Issue28986_ContentPage.SafeAreaNoWhiteSpaceAfterKeyboardDismissAndEdgeToggle` entry point. Reproduce the Android 36 SafeAreaEdges test and compare the measured ContentGrid height before and after the keyboard opens. Done means the test observes the ContentGrid shrinking when the keyboard is showing with SafeAreaEdges=All.

Written by the indexing model from the issue text.