🚩(project) add more backend AI feature flags

The Blocknote AI feature is a bit flaky, we want
to be able to disable it if to much issues arise,
without having to do a new release.
We add a bunch of feature flags to be able to
disable the AI features if needed:
- add AI_FEATURE_BLOCKNOTE_ENABLED, to display
or not the feature powered by blocknote
- add AI_FEATURE_LEGACY_ENABLED, to display or not
the legacy AI features

src/frontend/apps/e2e/__tests__/app-impress/utils-common.ts

@@ -14,6 +14,8 @@ export const CONFIG = {
     color: '#8bc6ff',
   },
   AI_FEATURE_ENABLED: true,
+  AI_FEATURE_BLOCKNOTE_ENABLED: true,
+  AI_FEATURE_LEGACY_ENABLED: true,
   API_USERS_SEARCH_QUERY_MIN_LENGTH: 3,
   CRISP_WEBSITE_ID: null,
   COLLABORATION_WS_URL: 'ws://localhost:4444/collaboration/ws/',