Actions `cluster:admin/repository/analyze/blob` and `cluster:admin/repository/analyze/register` and so on are only invoked via the transport service, they do not need to register as client actions so we can drop the `ActionType` instance. Instead the root `RepositoryAnalyzeAction` should create and register all these transport actions itself. But even the root `RepositoryAnalyzeAction` should not be an `ActionType` derivative, we should just declare an `ActionType` instance directly. Moreover we can use `ActionType#localOnly` since the client action does not run on remote clusters.
x-pack/plugin/snapshot-repo-test-kit/src/main/java/org/elasticsearch/repositories/blobstore/testkit/BlobAnalyzeAction.java
private final BlobStoreRepository repository;
        private final BlobContainer blobContainer;
        private final ActionListener<BlobAnalyzeAction.Response> listener;
        private final Random random;
        private final boolean checksumWholeBlob;
        private final long checksumStart;
        private final long checksumEnd;
        private final List<DiscoveryNode> earlyReadNodes;
        private final List<DiscoveryNode> readNodes;
        private final GroupedActionListener<NodeResponse> readNodesListener;
        private final ListenableFuture<WriteDetails> write1Step = new ListenableFuture<>();
        private final ListenableFuture<WriteDetails> write2Step = new ListenableFuture<>();
        private final CancellableThreads cancellableThreads = new CancellableThreads();
        BlobAnalysis(
            TransportService transportService,
            CancellableTask task,
            BlobAnalyzeAction.Request request,
            BlobStoreRepository repository,
            BlobContainer blobContainer,
            ActionListener<BlobAnalyzeAction.Response> listener
        ) {
            this.transportService = transportService;
            this.task = task;
            this.request = request;
            this.repository = repository;
            this.blobContainer = blobContainer;
            this.listener = listener;
            this.random = new Random(this.request.seed);
            checksumWholeBlob = random.nextBoolean();
            if (checksumWholeBlob) {