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/GetBlobChecksumAction.java
private final long throttleNanos; 
        Response(long bytesRead, long checksum, long firstByteNanos, long elapsedNanos, long throttleNanos) {
            this.bytesRead = bytesRead;
            this.checksum = checksum;
            this.firstByteNanos = firstByteNanos;
            this.elapsedNanos = elapsedNanos;
            this.throttleNanos = throttleNanos;
        }
        Response(StreamInput in) throws IOException {
            super(in);
            this.bytesRead = in.readVLong();
            this.checksum = in.readLong();
            this.firstByteNanos = in.readVLong();
            this.elapsedNanos = in.readVLong();
            this.throttleNanos = in.readVLong();
        }
        @Override
        public void writeTo(StreamOutput out) throws IOException {
            out.writeVLong(bytesRead);
            out.writeLong(checksum);
            out.writeVLong(firstByteNanos);
            out.writeVLong(elapsedNanos);
            out.writeVLong(throttleNanos);
        }
        @Override
        public String toString() {
            return "GetRepositoryBlobChecksumResponse{"
                + "bytesRead="
                + bytesRead
                + ", checksum="