https://github.com/elastic/elasticsearch/pull/97304 removes several places that might do an expensive rebuild of the cluster state via `getStateForMasterService`. There's one other call we should be able to remove, in `JoinValidationService`, but it's a little tricky since we rely on seeing the last-accepted state for the cluster UUID validation, and it's not obviously ok to expose the last-accepted state without the no-master block.

This is a fairly minor issue because we do not do this join validation during elections, only if we're the elected master, and in that case `getStateForMasterService` is cheap. But that's not guaranteed, and we should strengthen this to avoid the that expensive step whenever possible.
server/src/main/java/org/elasticsearch/cluster/coordination/Coordinator.java
import org.elasticsearch.core.SuppressForbidden;
import org.elasticsearch.core.TimeValue;
import org.elasticsearch.discovery.ConfiguredHostsResolver;
import org.elasticsearch.discovery.DiscoveryModule;
import org.elasticsearch.discovery.DiscoveryStats;
import org.elasticsearch.discovery.HandshakingTransportAddressConnector;
import org.elasticsearch.discovery.PeerFinder;
import org.elasticsearch.discovery.SeedHostsProvider;
import org.elasticsearch.discovery.SeedHostsResolver;
import org.elasticsearch.discovery.TransportAddressConnector;
import org.elasticsearch.indices.breaker.CircuitBreakerService;
import org.elasticsearch.monitor.NodeHealthService;
import org.elasticsearch.monitor.StatusInfo;
import org.elasticsearch.threadpool.Scheduler;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.threadpool.ThreadPool.Names;
import org.elasticsearch.transport.NodeDisconnectedException;
import org.elasticsearch.transport.TransportRequest;
import org.elasticsearch.transport.TransportRequestOptions;
import org.elasticsearch.transport.TransportResponse.Empty;
import org.elasticsearch.transport.TransportService;
import org.elasticsearch.transport.Transports;
import org.elasticsearch.xcontent.json.JsonXContent;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;