[Failure Store] Add missing feature flag check in RBACEngineTests (#126215)

Resolves #126130

Author: slobodanadamovic

muted-tests.yml

@@ -377,9 +377,6 @@ tests:
 - class: org.elasticsearch.search.basic.SearchWithRandomDisconnectsIT
   method: testSearchWithRandomDisconnects
   issue: https://github.com/elastic/elasticsearch/issues/122707
-- class: org.elasticsearch.xpack.security.authz.RBACEngineTests
-  method: testBuildUserPrivilegeResponseCombinesIndexPrivileges
-  issue: https://github.com/elastic/elasticsearch/issues/126130
 - class: org.elasticsearch.xpack.esql.qa.single_node.GenerativeIT
   method: test
   issue: https://github.com/elastic/elasticsearch/issues/126139

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/permission/LimitedRoleTests.java

@@ -14,6 +14,7 @@
 import org.elasticsearch.action.bulk.TransportBulkAction;
 import org.elasticsearch.action.search.TransportSearchAction;
 import org.elasticsearch.cluster.metadata.AliasMetadata;
+import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.cluster.metadata.IndexAbstraction;
 import org.elasticsearch.cluster.metadata.IndexMetadata;
 import org.elasticsearch.cluster.metadata.Metadata;
@@ -647,6 +648,7 @@ public void testAllowedActionsMatcher() {
     }
 
     public void testAllowedActionsMatcherWithSelectors() {
+        assumeTrue("failure store feature must be enabled", DataStream.isFailureStoreFeatureFlagEnabled());
         Role fromRole = Role.builder(EMPTY_RESTRICTED_INDICES, "fromRole")
             .add(IndexPrivilege.READ_FAILURE_STORE, "ind*")
             .add(IndexPrivilege.READ, "ind*")

x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authz/RBACEngineTests.java

@@ -1416,6 +1416,7 @@ public void testBuildUserPrivilegeResponse() {
     }
 
     public void testBuildUserPrivilegeResponseCombinesIndexPrivileges() {
+        assumeTrue("failure store feature must be enabled", DataStream.isFailureStoreFeatureFlagEnabled());
         final BytesArray query = new BytesArray("""
             {"term":{"public":true}}""");
         final Role role = Role.builder(RESTRICTED_INDICES, "test", "role")