Replicate PR #33056: Fix ShellFlyoutContent UI test and improve Appium scroll actions

[Copilot]

Description of Change

Replicates all changes from PR #33056 which was closed as draft. This includes UI test infrastructure improvements and critical documentation to prevent common troubleshooting mistakes.

Test Infrastructure Enhancements:

• Added ScrollToBottom() method with position validation to ensure true bottom is reached
• Added CloseFlyout() helper that auto-detects screen dimensions
• Fixed namespace ambiguity for PointerInputDevice in MacCatalyst swipe actions

Test Case Updates:

• Added comprehensive test for Shell flyout footer padding bug ([Android] ShellFlyout Footer area not cleared after removing footer view #32883) that validates Y-position changes across three states: baseline, with footer, and after footer removal
• Reduced flyout item count from 50 to 20 for faster execution
• Added AutomationId to bottom flyout item for testability
• Added SafeAreaEdges configuration to Bugzilla44338

Critical Documentation:

• Added explicit warning section prohibiting deletion of build artifacts during troubleshooting
• Prevents incorrect assumption of stale binaries when test results seem unexpected

// New ScrollToBottom validates true bottom position
App.ScrollToBottom(FlyoutItem, "Flyout Item Bottom", 
    strategy: ScrollStrategy.Gesture, swipeSpeed: 50, maxScrolls: 100);

// New CloseFlyout helper
App.CloseFlyout();

Issues Fixed

Fixes #32883

Original prompt

can you create a new pr with all the changes that are in this pr #33056

And then create a second PR that only has the instruction markdown files from that PR in it

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.