[Island Browser] - Fix Cannot execute ILM policy delete step (#134636)

This PR focuses on the short term solution which add the logs-island_browser.user-* and 
logs-island_browser.device-* indices under the kibana_system role with deletion privileges 
to prevent a failed deletion error when the index enters the deletion phase for the ILM lifecycle, 
in upcoming PR. As it ships transform pipeline too hence read, write permissions are also required.

Author: janvi-elastic

docs/changelog/134636.yaml

@@ -0,0 +1,6 @@
+pr: 134636
+summary: "[Island Browser] Add `manage`, `create_index`, `read`, `index`, `write`, `delete`, permission for third party agent indices `kibana_system`"
+area: Authorization
+type: enhancement
+issues:
+  - 134136

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

@@ -549,11 +549,17 @@ static RoleDescriptor kibanaSystem(String name) {
                         TransportDeleteIndexAction.TYPE.name()
                     )
                     .build(),
-                // For ExtraHop, QualysGAV, and SentinelOne Application Dataset specific actions. Kibana reads, writes and manages this
-                // index
+                // For ExtraHop, QualysGAV, SentinelOne Application Dataset and Island Browser specific actions.
+                // Kibana reads, writes and manages this index
                 // for configured ILM policies.
                 RoleDescriptor.IndicesPrivileges.builder()
-                    .indices("logs-extrahop.investigation-*", "logs-qualys_gav.asset-*", "logs-sentinel_one.application-*")
+                    .indices(
+                        "logs-extrahop.investigation-*",
+                        "logs-qualys_gav.asset-*",
+                        "logs-sentinel_one.application-*",
+                        "logs-island_browser.user-*",
+                        "logs-island_browser.device-*"
+                    )
                     .privileges(
                         "manage",
                         "create_index",

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStoreTests.java

@@ -1976,12 +1976,15 @@ public void testKibanaSystemRole() {
             assertThat(kibanaRole.indices().allowedIndicesMatcher(RolloverAction.NAME).test(indexAbstraction), is(true));
         });
 
-        // Tests for third-party agent indices (ExtraHop, QualysGAV, SentinelOne) that `kibana_system` has full management access to
+        // Tests for third-party agent indices (ExtraHop, QualysGAV, SentinelOne, Island Browser) that `kibana_system`
+        // has full management access to
         // This includes read, write, create, delete, and all ILM-related management actions.
         Arrays.asList(
             "logs-extrahop.investigation-" + randomAlphaOfLength(randomIntBetween(1, 10)),
             "logs-qualys_gav.asset-" + randomAlphaOfLength(randomIntBetween(1, 10)),
-            "logs-sentinel_one.application-" + randomAlphaOfLength(randomIntBetween(1, 10))
+            "logs-sentinel_one.application-" + randomAlphaOfLength(randomIntBetween(1, 10)),
+            "logs-island_browser.user-" + randomAlphaOfLength(randomIntBetween(1, 10)),
+            "logs-island_browser.device-" + randomAlphaOfLength(randomIntBetween(1, 10))
         ).forEach((index_qualys_extra_hop) -> {
             final IndexAbstraction indexAbstraction = mockIndexAbstraction(index_qualys_extra_hop);