[PM-5979] Refactor EnvironmentService (#8040)

Refactor environment service to emit a single observable. This required significant changes to how the environment service behaves and tackles much of the tech debt planned for it.

apps/web/config/development.json

@@ -10,6 +10,15 @@
     "proxyNotifications": "http://localhost:61840",
     "wsConnectSrc": "ws://localhost:61840"
   },
+  "additionalRegions": [
+    {
+      "key": "LOCAL",
+      "domain": "localhost",
+      "urls": {
+        "webVault": "https://localhost:8080"
+      }
+    }
+  ],
   "flags": {
     "secretsManager": true,
     "showPasswordless": true,