[backport rh-test] change cloud feature flags to be loaded dynamically at runtime rather than set in build (#6257)

## Summary

Backport of #6246 to `rh-test` branch.

This PR cherry-picks commit d7a58a7a9b to
the `rh-test` branch with merge conflicts resolved.

### Conflicts Resolved

**GraphCanvas.vue:**
- Accepted incoming template structure changes (removed betaMenuEnabled
check, added workflow tabs)
- Added missing imports: TopbarBadges, WorkflowTabs, isNativeWindow
- Added showUI computed property

**cloudBadge.ts:**
- Deleted file (replaced by cloudBadges.ts plural)

**telemetry/types.ts:**
- Merged interface methods from both branches
- Accepted incoming event constant changes (app: prefix)

Original PR: #6246

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6257-backport-rh-test-change-cloud-feature-flags-to-be-loaded-dynamically-at-runtime-rather--2966d73d365081a59daeeb6dfbbf2af5)
by [Unito](https://www.unito.io)

global.d.ts

@@ -4,12 +4,19 @@ declare const __SENTRY_DSN__: string
 declare const __ALGOLIA_APP_ID__: string
 declare const __ALGOLIA_API_KEY__: string
 declare const __USE_PROD_CONFIG__: boolean
-declare const __MIXPANEL_TOKEN__: string
 
-type BuildFeatureFlags = {
-  REQUIRE_SUBSCRIPTION: boolean
+interface Window {
+  __CONFIG__: {
+    mixpanel_token?: string
+    subscription_required?: boolean
+    server_health_alert?: {
+      message: string
+      tooltip?: string
+      severity?: 'info' | 'warning' | 'error'
+      badge?: string
+    }
+  }
 }
-declare const __BUILD_FLAGS__: BuildFeatureFlags
 
 interface Navigator {
   /**