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
public String getBlobPath() {
            return blobPath;
        }
        public String getBlobName() {
            return blobName;
        }
        public long getRangeStart() {
            assert isWholeBlob() == false;
            return rangeStart;
        }
        public long getRangeEnd() {
            assert isWholeBlob() == false;
            return rangeEnd;
        }
        public long getRangeLength() {
            assert isWholeBlob() == false;
            return rangeEnd - rangeStart;
        }
        /**
         * @return whether we should read the whole blob or a range.
         */
        boolean isWholeBlob() {
            return rangeEnd == 0L;
        }
        @Override
        public void writeTo(StreamOutput out) throws IOException {
            super.writeTo(out);
            out.writeString(repositoryName);
            out.writeString(blobPath);
            out.writeString(blobName);