When resolving a user's roles, if there are any roles that depend on DLS/FLS, and that is not permitted by the current license, we skip them.
https://github.com/elastic/elasticsearch/blob/f435488484ec844962d49371b8917c135fe6f714/x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authz/store/CompositeRolesStore.java#L188-L192

However, we do not perform any logging in this circumstance, and rely on the user discovering that their roles are missing.

We should
1. Add a `WARN` log message
2. Add a Warning header

when this occurs. 
x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authz/store/CompositeRolesStoreTests.java
callback.onResponse(RoleRetrievalResult.success(Collections.emptySet()));
            return null;
        }).when(nativeRolesStore).getRoleDescriptors(isASet(), anyActionListener());
        final ReservedRolesStore reservedRolesStore = new ReservedRolesStore();
        final InMemoryRolesProvider inMemoryProvider1 = new InMemoryRolesProvider((roles) -> {
            Set<RoleDescriptor> descriptors = new HashSet<>();
            if (roles.contains("roleA")) {
                descriptors.add(
                    new RoleDescriptor(
                        "roleA",
                        null,
                        new IndicesPrivileges[] {
                            IndicesPrivileges.builder().privileges("READ").indices("foo").grantedFields("*").build() },
                        null
                    )
                );
            }
            return RoleRetrievalResult.success(descriptors);
        });
        final BiConsumer<Set<String>, ActionListener<RoleRetrievalResult>> failingProvider = (roles, listener) -> listener.onFailure(
            new Exception("fake failure")
        );
        final AtomicReference<Collection<RoleDescriptor>> effectiveRoleDescriptors = new AtomicReference<Collection<RoleDescriptor>>();
        final Map<String, List<BiConsumer<Set<String>, ActionListener<RoleRetrievalResult>>>> customRoleProviders = randomBoolean()
            ? Map.of("custom", List.of(inMemoryProvider1, failingProvider))
            : Map.of("custom", List.of(inMemoryProvider1), "failing", List.of(failingProvider));
        final CompositeRolesStore compositeRolesStore = buildCompositeRolesStore(
            SECURITY_ENABLED_SETTINGS,
            fileRolesStore,
            nativeRolesStore,