[PM-1349] Update client service to retrieve feature flags from API (#5064)

* [PM-1351] Add property to server-config.response. Change config to be able to fetch without being authed.

* [PM-1351] fetch every hour.

* [PM-1351] fetch on vault sync.

* [PM-1351] browser desktop fetch configs on sync complete.

* [PM-1351] Add methods to retrieve feature flags

* [PM-1351] Add enum to use as key to get values feature flag values

* [PM-1351] Remove debug code

* [PM-1351] Get flags when unauthed. Add enums as params. Hourly always fetch.

* [PM-1351] add check for authed user using auth service

* [PM-1351] remove unnecessary timer on account unlock

libs/common/src/enums/feature-flag.enum.ts

@@ -0,0 +1,3 @@
+export enum FeatureFlag {
+  DisplayEuEnvironmentFlag = "display-eu-environment",
+}