iOS engine artifacts Flutter.xcframework contains old architecture triples directories

[jmagman]

As of #85052 the Flutter engine iOS artifacts contain iOS ARM simulator binaries, and the Flutter.xcframework should only contain a ios-arm64_x86_64-simulator directory. It also was built on Xcode 12, so the ios-armv7_arm64 directory has been renamed ios-arm64_armv7. However, because the artifact downloads do not remove old directories from the bundle, the old and new architecture triple directories exist next to each other.

Steps to reproduce

$ git checkout stable
$ flutter precache
$ git checkout a2fa6d4 # master as of https://github.com/flutter/flutter/pull/85052
$ flutter precache
$ ls bin/cache/artifacts/engine/ios/Flutter.xcframework

Expected

ios-arm64_armv7
ios-arm64_x86_64-simulator

Actual

ios-arm64_armv7
ios-arm64_x86_64-simulator
ios-armv7_arm64
ios-x86_64-simulator

[jmagman]

This is blocking iOS ARM simulator adoption. The incorrect simulator directory happens to be selected when I test #85059 on an M1 ARM Mac.

[jmagman]

More urgently than iOS ARM simulator adoption, if the tool prefers embedding the Xcode 11 style ios-armv7_arm64 over the Xcode 12 ios-arm64_armv7 then the engine will remain out of date and won't be built with the newer cached dart.

[jmagman]

See also #74818. The fix at #74818 didn't address this.
When this reproduced

flutter/packages/flutter_tools/lib/src/cache.dart

Lines 947 to 951 in e467018

	/// Unzipping multiple file into a directory will not remove old files
	/// from previous versions that are not present in the new bundle.
	final Directory destination = location.childDirectory(
	tempFile.fileSystem.path.basenameWithoutExtension(tempFile.path)
	);

destination = flutter/bin/cache/artifacts/engine/ios/artifacts which never exists.

[github-actions]

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