fix(web-backend): validate and pin provider redirect hops (#1553)

* fix(web-backend): validate and pin every provider redirect hop

* fix(web-backend): separate provider metadata from connection authority

apps/web-e2e/project.json

@@ -5,6 +5,7 @@
     "sourceRoot": "apps/web-e2e/src",
     "implicitDependencies": [
         "web",
+        "web-backend",
         "stalker-mock-server",
         "xtream-mock-server"
     ],