[infra] Remove path dependencies

[dcharkes]

Bug:

• [infra] Convert this mono_repo to use pub workspaces #1223

Split off:

• [infra] Use Pub Workspaces #1884

This PR removes the path dependencies on package:native_assets_cli and package:native_toolchain_c within the workspace.

For test projects, when copying them over, add dependency_overrides to the right location.

pkgs/native_assets_cli/tool/dependencies.dart is removed. Upgrading dependencies can be done with dart pub upgrade native_assets_cli --tighten --major-versions

[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
pkgs/objective_c/lib/src/ns_input_stream.dart