Monitoring data can now be stored in `metrics-*` patterns when collected through elastic-agent. [Our documentation](https://www.elastic.co/guide/en/kibana/current/monitoring-data.html) recommends to use the `monitoring_user` role to view the data in Stack Monitoring application but that role does not have permissions to read from the metrics pattern.

`monitoring_user` should be allowed the same permissions on `metrics-*` as `.monitoring-*`
x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStoreTests.java
assertThat(
            remoteMonitoringAgentRole.indices()
                .allowedIndicesMatcher("indices:foo")
                .test(mockIndexAbstraction(randomAlphaOfLengthBetween(8, 24))),
            is(false)
        );
        final String monitoringIndex = ".monitoring-" + randomAlphaOfLength(randomIntBetween(0, 13));
        assertThat(
            remoteMonitoringAgentRole.indices().allowedIndicesMatcher("indices:foo").test(mockIndexAbstraction(monitoringIndex)),
            is(true)
        );
        assertThat(
            remoteMonitoringAgentRole.indices().allowedIndicesMatcher("indices:bar").test(mockIndexAbstraction(monitoringIndex)),
            is(true)
        );
        assertThat(
            remoteMonitoringAgentRole.indices().allowedIndicesMatcher(DeleteIndexAction.NAME).test(mockIndexAbstraction(monitoringIndex)),
            is(true)
        );
        assertThat(
            remoteMonitoringAgentRole.indices().allowedIndicesMatcher(CreateIndexAction.NAME).test(mockIndexAbstraction(monitoringIndex)),
            is(true)
        );
        assertThat(
            remoteMonitoringAgentRole.indices().allowedIndicesMatcher(IndexAction.NAME).test(mockIndexAbstraction(monitoringIndex)),
            is(true)
        );
        assertThat(
            remoteMonitoringAgentRole.indices().allowedIndicesMatcher(DeleteAction.NAME).test(mockIndexAbstraction(monitoringIndex)),
            is(true)