Removes the unkown overview from the group security dashboard

ee/app/assets/javascripts/security_dashboard/components/vulnerability_count_list.vue

 <script>
 import { mapGetters, mapState } from 'vuex';
 import VulnerabilityCount from './vulnerability_count.vue';
-import { CRITICAL, HIGH, MEDIUM, LOW, UNKNOWN } from '../store/modules/vulnerabilities/constants';
+import { CRITICAL, HIGH, MEDIUM, LOW } from '../store/modules/vulnerabilities/constants';
 
-const SEVERITIES = [CRITICAL, HIGH, MEDIUM, LOW, UNKNOWN];
+const SEVERITIES = [CRITICAL, HIGH, MEDIUM, LOW];
 
 export default {
   name: 'VulnerabilityCountList',

ee/app/assets/javascripts/security_dashboard/store/modules/vulnerabilities/constants.js

@@ -2,4 +2,3 @@ export const CRITICAL = 'critical';
 export const HIGH = 'high';
 export const MEDIUM = 'medium';
 export const LOW = 'low';
-export const UNKNOWN = 'unknown';