Brojd/get stack from backend on insights (#3654)

# What this PR does
get stack from backend instead of parsing url

## Which issue(s) this PR fixes
https://github.com/grafana/oncall-private/issues/2434

## Checklist

- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)

grafana-plugin/src/models/organization/organization.types.ts

@@ -13,6 +13,7 @@ export interface Organization {
     discussion_group_name: string;
   };
   name: string;
+  stack_slug: string;
   slack_team_identity: {
     general_log_channel_id: string;
     general_log_channel_pk: string;

grafana-plugin/src/pages/insights/Insights.tsx

@@ -39,11 +39,12 @@ import getTotalAlertGroupsScene from './scenes/TotalAlertGroups';
 import getTotalAlertGroupsByStateScene from './scenes/TotalAlertGroupsByState';
 import getVariables from './variables';
 
-const getDefaultStackValue = (isOpenSource: boolean) =>
-  isOpenSource ? 'self_hosted_stack' : location.host.split('.')[0];
-
 const Insights = observer(() => {
-  const { isOpenSource, insightsDatasource } = useStore();
+  const {
+    isOpenSource,
+    insightsDatasource,
+    organizationStore: { currentOrganization },
+  } = useStore();
   const [showAllStackInfo, setShowAllStackInfo] = useState(false);
   const [datasource, setDatasource] = useState<string>();
 
@@ -51,7 +52,7 @@ const Insights = observer(() => {
     () => ({
       isOpenSource,
       datasource: { uid: isOpenSource ? '$datasource' : insightsDatasource },
-      stack: getDefaultStackValue(isOpenSource),
+      stack: currentOrganization?.stack_slug,
     }),
     []
   );