Reproducer for #58445: TextInput takes the responder on a keystroke after a two-finger gesture

[msageryd]

Reproducer for #58445, and for the counter half in react/react#37571. Pure React Native, no gesture library.

Test Plan

Run RNTester on a physical iOS device (the Simulator's Option-pinch lands both fingers in one event and does not trigger the drift). Open Playground.

1. Put two fingers on the blue box one after the other, lift both together: the "shadow of trackedTouchCount" line turns red at 1.
2. Tap the input, type one character: the second line turns red, "selectionChange walk with 0 active touches".
3. Tap "Press me" once: the counter does not increment. A second tap does.

Control: lift the fingers one at a time in step 1, and step 3 increments on the first tap.

Changelog:

[INTERNAL] [ADDED] - RNTester playground reproducer for #58445, TextInput takes the responder on a keystroke after a two-finger gesture

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