Add TextInput layout issue example to RNTester (#54304)

[krishx06]

Summary:

This pull request adds a new example to RNTester named TextInputLayoutBugExample, which reproduces the layout issue in TextInput where multiline inputs with a fixed height and textAlignVertical="top" display text inconsistently on the first render.

The example makes it easier for maintainers and contributors to visualize, debug, and verify fixes for the problem reported in #54304

Changelog:

[INTERNAL] [ADDED] - Add TextInput layout issue example to RNTester (#54304)

Test Plan:

1. Build and run RNTester on iOS.
2. Navigate to Components → TextInput Layout Issue.
3. Tap “Long Note” and observe that the text appears squashed near the top of the TextInput.
4. Tap “Back”, then open “Short Note”, and return to “Long Note” —
   the text now displays correctly, demonstrating the layout inconsistency.

This confirms that the example reliably reproduces the issue described in (#54304)
Attached below are two screenshots — one showing the bug (initial render) and another after navigation, where the text alignment corrects itself.

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[sbuggay]

I don't think we need a test page just to reproduce an issue, I think this makes more sense to put in the regular TextInput tests once #54304 has been fixed.