[native_assets_cli] Deprecate output_directory

[dcharkes]

Closes: #2058

Implements input.outputDirectory on top of input.outputDirectoryShared in the hook API.

New directory structure

• .dart_tool/
  • native_assets_builder/
    • <package_name>/
      • <config-checksum>/
        • input.json
        • output.json
        • dependencies.dependencies_hash_file.json
        • package_config_hashable.json
        • hook.dill
        • hook.dill.d
        • stderr.txt
        • stdout.txt
        • out/ <- old output directory, created by SDK (stays here for backwards compatibility purposes)
    • shared/
      • <package_name>/
        • build/ (input.outputDirectoryShared)
          • <config-checksum>/ <- new output directory, created by the hook
        • link/ (input.outputDirectoryShared)
          • <config-checksum>/ <- new output directory, created by the hook

Version skew

The out_dir in the JSON is still emitted for the time being, until everyone has migrated.

Fixes in this PR

The native_toolchain_c tests were not looking at what the input.outputDirectory was but assumed that the temp dir was that directory. These tests have been fixed.

The NativeAssetsBuildRunner was passing HookInput around instead of the buildDir and tried to reverse engineer the buildDir by doing input.outputDirector.resolve('../'). This has now been cleaned up.

[github-actions]

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// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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pkgs/jni/lib/src/third_party/generated_bindings.dart
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[mosuem]

I don't get this conceptually - why do we need to pass the outputDirectory to then retrieve the outputDirectory?

[dcharkes]

BuildInput.outputDirectory now comes up with it's own directory instead of taking the one from the constructor.

I think we should deprecate the parameter in the constructor so that it's clear that that's no longer used.