[native_doc_dartifier] Add initial framework for End-to-End tests

[marshelino-maged]

Replaces #2379, which was closed due to fork deletion by mistake.
Related to: #2343

End-to-End (E2E) testing workflow that validates Dartified Java code against expected Java behavior.

Java source files located in: dartify_simple_cases/java/com/...
Java snippet definitions in: dartify_simple_cases/java_snippets.dart

Tool: tool/prepare_dartify_test.dart that needs to be run before flutter test

• Generate JNI bindings for the Java package
• Compile Java files
• Dartify Java snippets
• Save output to: dartify_simple_cases/dartified_snippets/...

A runtime Dart test: test/runtime_test.dart
This verifies that the Dartified output matches the expected Java result (not running the Java snippet yet, but assuming we know the result).

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• I’ve reviewed the contributor guide and applied the relevant portions to this PR.

[marshelino-maged]

We have added the GEMINI_API_KEY now but the CI still fails, can you please investigate @marshelino-maged?

@HosseinYousefi, I see the error in the CI run is about the GEMINI_API_KEY.

Method doesn't allow unregistered callers (callers without established identity). Please use API Key or other form of API consumer identity to call this API.

When trying with my API key on my fork, I pass all the tests and can't reproduce that error.

[github-actions]

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Package	Changed Files
package:native_doc_dartifier	pkgs/native_doc_dartifier/pubspec.yaml

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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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Files
pkgs/jni/lib/src/third_party/generated_bindings.dart
pkgs/native_doc_dartifier/lib/native_doc_dartifier.dart
pkgs/native_doc_dartifier/lib/src/native_doc_dartifier_base.dart
pkgs/objective_c/lib/src/ns_input_stream.dart

[HosseinYousefi]

When trying with my API key on my fork, I pass all the tests and can't reproduce that error.

@athomas Could you please double check that the GEMINI_API_KEY is indeed a secret in this repo?