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
this.nodeId = nodeId;
            this.nodeName = nodeName;
            this.beforeWriteComplete = beforeWriteComplete;
            this.isNotFound = isNotFound;
            this.firstByteNanos = firstByteNanos;
            this.throttleNanos = throttleNanos;
            this.elapsedNanos = elapsedNanos;
        }
        public ReadDetail(StreamInput in) throws IOException {
            nodeId = in.readString();
            nodeName = in.readString();
            beforeWriteComplete = in.readBoolean();
            isNotFound = in.readBoolean();
            firstByteNanos = in.readVLong();
            throttleNanos = in.readVLong();
            elapsedNanos = in.readVLong();
        }
        @Override
        public void writeTo(StreamOutput out) throws IOException {
            out.writeString(nodeId);
            out.writeString(nodeName);
            out.writeBoolean(beforeWriteComplete);
            out.writeBoolean(isNotFound);
            out.writeVLong(firstByteNanos);
            out.writeVLong(throttleNanos);
            out.writeVLong(elapsedNanos);
        }
        @Override
        public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
            builder.startObject();