On boarding flow: add a screen to select account provider among a fixed list (#4769)

* Hide login with QrCode when the app is opened by a link

* Fix UI on ChangeAccountProviderView.

* Add flow to choose between a fixed list of account provider

* Update screenshots

* Fix licence header

* Rename preview.

* Ensure that the default account provider cannot be "*"
This should not happen IRL, but better be robust against issue in application configuration.

* Create const of any account provider value

* Fix typo

---------

Co-authored-by: ElementBot <android@element.io>

features/enterprise/api/src/main/kotlin/io/element/android/features/enterprise/api/EnterpriseService.kt

@@ -21,4 +21,14 @@ interface EnterpriseService {
 
     fun firebasePushGateway(): String?
     fun unifiedPushDefaultPushGateway(): String?
+
+    companion object {
+        const val ANY_ACCOUNT_PROVIDER = "*"
+    }
+}
+
+fun EnterpriseService.canConnectToAnyHomeserver(): Boolean {
+    return defaultHomeserverList().let {
+        it.isEmpty() || it.contains(EnterpriseService.ANY_ACCOUNT_PROVIDER)
+    }
 }