Allow users to pass in Xcode build settings as env variables to flutter build macos FLUTTER_XCODE_ (#81384)

For #81837

For https://github.com/flutter/flutter/issues/81837

https://github.com/flutter/flutter/issues/81950 to re-enabled

This reverts commit 35ad43f2.

This turns off the "directives_ordering" lint when analyzing samples, since it's indeterminate what the ordering will be, given that samples derive their imports both from the template and the example code.

This is temporary to avoid broken builds, but the correct solution is to reorder the output so that the imports are ordered properly so that we give the proper example for our users.

* aac365861 Roll Skia from 14efdd3d50db to 3010f3d79193 (4 revisions) (flutter/engine#25857)

* f45f52f5e Move path part files to libraries (flutter/engine#25842)

* d96669f0d Roll Skia from 3010f3d79193 to 5276ba274b38 (1 revision) (flutter/engine#25859)

* 43994abed Use "blur_sigma" instead of "blur_radius" in Shadow. (flutter/engine#25760)

* 74ac01030 Roll Dart SDK from 1e3e5efcd47e to 6397e8b91103 (18 revisions) (flutter/engine#25861)

* d462cfd64 Remove flake inducing timeouts (flutter/engine#25847)

* 258f63a93 Roll Skia from 5276ba274b38 to 31fddc376993 (14 revisions) (flutter/engine#25862)

* 1bf01a1ff fuchsia: Reliably forward View insets (flutter/engine#25381)

* 274006232 Roll Skia from 31fddc376993 to 097263bb5089 (1 revision) (flutter/engine#25865)

* 4aae6b328 Roll Dart SDK from 6397e8b91103 to ee8eb0a65efa (1 revision) (flutter/engine#25869)

* d1f31c719 Roll Skia from 097263bb5089 to 5dfb3f40684b (1 revision) (flutter/engine#25870)

* 428ef1012 deflake (flutter/engine#25864)

* 01b9db82f Roll Dart SDK from ee8eb0a65efa to 8c109a734bdc (1 revision) (flutter/engine#25872)

* e623c0959 Roll Dart SDK from 8c109a734bdc to b98a1eec5eb5 (1 revision) (flutter/engine#25873)

* 7ce622616 Roll Dart SDK from b98a1eec5eb5 to 6ecae204598d (1 revision) (flutter/engine#25874)

* 554c24cbc Roll Skia from 5dfb3f40684b to 5c95bcb48b9b (1 revision) (flutter/engine#25876)

* 03bd2e358 Roll Dart SDK from 6ecae204598d to 3cc6cdab8eaf (2 revisions) (flutter/engine#25877)

* 53fdd895e Roll Skia from 5c95bcb48b9b to c779d432f336 (1 revision) (flutter/engine#25880)

* 98ee65b6d Roll Skia from c779d432f336 to ff8b52df55ff (2 revisions) (flutter/engine#25881)

* d84caa736 Roll Dart SDK from 3cc6cdab8eaf to b8f4018535fa (2 revisions) (flutter/engine#25885)

* 156760e04 Roll Skia from ff8b52df55ff to ec79349bad50 (1 revision) (flutter/engine#25886)

* 23cd8e540 Revert the Dart SDK to 1e3e5efcd47edeb7ae5a69e146c8ea0559305a98 (flutter/engine#25887)

* 578449f10 Fix crash when both FlutterFragmentActivity and FlutterFragment are destroyed and recreated (flutter/engine#25851)

prototypeItem added to ReorderableList and ReorderableListView along with tests

This reverts commit a3893aea.

Fixes https://github.com/flutter/flutter/issues/81587

The assert was never hitting because it was first hitting a
null cast error in the `renderer.parent!` line in the for
loop.

Rewrites tools/gen_keycodes, the script that generates key mappings across the framework and the engine.

a2ce3dab4 [tool] add `all` and `dry-run` flags to publish-plugin command (flutter/plugins#3776) (#81589)