Testing: add a small Addressable build including scenes

The TestCommon folder has reference built content that is used for testing, we are still playing "catch up" because the testing coverage is still spotty for all the different build pipelines and variations that UnityDataTool covers.

Currently there is no reference AssetBundles that are built by Addressables so testing of that case has only happened in adhoc fashion, e.g. with large projects. Its primarily Analyze that is of concern - the dump, archive and serialized-file commands are generalized enough that they are unlikely to have bugs specific to Addressables.

The "Scene" case is a particular special case and required fixing because it wasn't properly handled by Analyze (issue #81). So any reference content should include at least one AssetBundle containing scenes.

TestCommon フォルダーで、既存の参照用ビルド済みコンテンツと、Analyze がそれをどのように処理するかを確認することから始めます。少なくとも 1 つのシーンを含む小さな Addressables AssetBundle を作成し、issue #81 で説明されているシーンケースに対する Analyze のカバレッジを確認します。