This reverts commit e88a387b.

* Gesture recognizer cleanup

1) Make OneSequenceGestureRecognizer.addAllowedPointer()
   call startTrackingPointer(), and change subclasses to
   call super.addAllowedPointer() in place of manually
   calling startTrackingPointer().
2) Fix addAllowedPointer overrides to take PointerDownEvent
   where some were taking PointerEvent.
3) Add API documentation to OneSequenceGestureRecognizer
4) Make the following fields in OneSequenceGestureRecognizer
   private with public getters instead of publicly writable:
   `state`, `primaryPointer`, and `initialPosition`.
5) Clean up gesture recognizer state in
   OneSequenceGestureRecognizer.didStopTrackingLastPointer.

Fixes #81883

This reverts commit 4a720313.

Depending on the user's build configuration, we may output
multi-architecture or single-architecture binaries. Prefer to install
the multi-architecture binary if built, otherwise fall back to the
single-architecture binary.

This eliminates the use of the Install.ps1 script during Windows app
installation and instead uses uwptool install. Install.ps1 was the
slowest part of app install, and had resource contention issues that
frequently caused it to fail.

* 590813ff3 Roll Skia from aecf8d517143 to df2dbad1a87d (9 revisions) (flutter/engine#26168)

* bce27b631 Roll Fuchsia Mac SDK from a6aB7cNgl... to 9-tG_VdU_... (flutter/engine#26169)

* 5de7fc17e Roll Skia from df2dbad1a87d to bc8e0d8ba0d4 (1 revision) (flutter/engine#26171)

* 4b3966ba4 Reland "Fix a11y placeholder on desktop; auto-enable engine semantics" (flutter/engine#26134)

* d8b83b71f Roll Fuchsia Linux SDK from RT1RbBM69... to q_v1AFsEq... (flutter/engine#26173)

* 570e51cf4 Roll Fuchsia Mac SDK from 9-tG_VdU_... to PVI875Hyp... (flutter/engine#26174)

* 3cd2eb547 Roll Skia from bc8e0d8ba0d4 to bc7c754ce395 (1 revision) (flutter/engine#26175)

* 1c769b441 Roll Fuchsia Linux SDK from q_v1AFsEq... to lU-S8er5G... (flutter/engine#26176)

* dad87569f Roll Fuchsia Mac SDK from PVI875Hyp... to TB587FHc5... (flutter/engine#26177)

* f426368f2 Roll Skia from bc7c754ce395 to f91ce0201328 (1 revision) (flutter/engine#26178)

* 00e1c1067 Remove counter from eintr wrapper (flutter/engine#26124)