Remove role mapping block check (elastic#114223)

This method is used in multiple contexts that may not all handle
cluster-block exceptions gracefully, esp. since some types of cluster
blocks are retryable. Removing this, and may follow up with handling the
cluster state block for the affected transport actions instead.

Author: n1v0lg

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/RoleMappingMetadata.java

@@ -12,7 +12,6 @@
 import org.elasticsearch.cluster.AbstractNamedDiffable;
 import org.elasticsearch.cluster.ClusterState;
 import org.elasticsearch.cluster.NamedDiff;
-import org.elasticsearch.cluster.block.ClusterBlockLevel;
 import org.elasticsearch.cluster.metadata.Metadata;
 import org.elasticsearch.common.collect.Iterators;
 import org.elasticsearch.common.io.stream.StreamInput;
@@ -58,7 +57,6 @@ public final class RoleMappingMetadata extends AbstractNamedDiffable<Metadata.Cu
     private static final RoleMappingMetadata EMPTY = new RoleMappingMetadata(Set.of());
 
     public static RoleMappingMetadata getFromClusterState(ClusterState clusterState) {
-        clusterState.blocks().globalBlockedRaiseException(ClusterBlockLevel.READ);
         return clusterState.metadata().custom(RoleMappingMetadata.TYPE, RoleMappingMetadata.EMPTY);
     }