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/ContendedRegisterAnalyzeAction.java
}
        public String getRegisterName() {
            return registerName;
        }
        public int getRequestCount() {
            return requestCount;
        }
        public int getInitialRead() {
            return initialRead;
        }
        @Override
        public Task createTask(long id, String type, String action, TaskId parentTaskId, Map<String, String> headers) {
            return new CancellableTask(id, type, action, getDescription(), parentTaskId, headers);
        }
        @Override
        public String toString() {
            return getDescription();
        }
        @Override
        public String getDescription() {
            return Strings.format(
                """
                    ContendedRegisterAnalyzeAction.Request{\
                    repositoryName='%s', containerPath='%s', registerName='%s', requestCount='%d', initialRead='%d'}""",
                repositoryName,
                containerPath,
                registerName,
                requestCount,
                initialRead
            );