[SG-483] Trial Initiation Cleanup (#4064)

* Remove 'showTrial' feature flag

* Replace Register component with trial and redirect trial routes to register

* Shore up fallback logic for bad params

* Remove register component that is no longer used

* Adjust register form margin top

* Update unit tests for new param handling

* Use enums for org names and add missing org routing

* Add new tests and fix existing flaky ones

* Use an enum for layouts

apps/web/config/ee.json

@@ -6,7 +6,5 @@
     "proxyNotifications": "http://localhost:61841",
     "port": 8081
   },
-  "flags": {
-    "showTrial": false
-  }
+  "flags": {}
 }