[EC-416] Refactor organization permission checks (#3252)

* Replace Permissions enum and helper methods with callbacks

* Remove scim feature flag

* Check if org has feature enabled as part of canManage checks

* Pin jest-mock-extended at v2.0.6 to fix compilation error

apps/web/src/utils/flags.ts

@@ -1,6 +1,5 @@
 export type Flags = {
   showTrial?: boolean;
-  scim?: boolean;
 };
 
 export type FlagName = keyof Flags;