feat(login): use default org for login without provided org context (#6625)

* start feature flags

* base feature events on domain const

* setup default features

* allow setting feature in system api

* allow setting feature in admin api

* set settings in login based on feature

* fix rebasing

* unit tests

* i18n

* update policy after domain discovery

* some changes from review

* check feature and value type

* check feature and value type

cmd/defaults.yaml

@@ -761,6 +761,8 @@ DefaultInstance:
       Greeting: Hello {{.DisplayName}},
       Text: The password of your user has changed. If this change was not done by you, please be advised to immediately reset your password.
       ButtonText: Login
+  Features:
+    - FeatureLoginDefaultOrg: true
 
   Quotas:
     # Items take a slice of quota configurations, whereas, for each unit type and instance, one or zero quotas may exist.
@@ -819,6 +821,7 @@ InternalAuthZ:
         - "iam.flow.read"
         - "iam.flow.write"
         - "iam.flow.delete"
+        - "iam.feature.write"
         - "org.read"
         - "org.global.read"
         - "org.create"