[EC-247] Add columns to provider portal clients table (#3147)

* Added properties "userCount", "seats" and "plan" to ProviderOrganizationResponse

* Added text message "numberOfUsers"

* Updated provider clients component with new columns

* Removed never used dependency

* Changed userCount to non nullable number

* Added condition on the component to only show seats number if not null

* Changed view condition to an explicit check

apps/web/src/locales/en/messages.json

@@ -5306,5 +5306,8 @@
   },
   "cardBrandMir": {
     "message": "Mir"
+  },
+  "numberOfUsers": {
+    "message": "Number of users"
   }
 }