Move migration screen to within the room list (#2361)

* Rename migration bg drawable and add night variant
* Move `migration` package from `ftue` to `messages:impl` module
* Update `SunsetPage` with light and dark modes
* Fix bloom colors when nested theme is used
* Integrate the migration screen in the room list
* Fix `WaitListView` cancel button color
* Clear migration store when removing the app's cache

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

tools/localazy/config.json

@@ -106,7 +106,8 @@
       "includeRegex" : [
         "screen_roomlist_.*",
         "session_verification_banner_.*",
-        "confirm_recovery_key_banner_.*"
+        "confirm_recovery_key_banner_.*",
+        "screen_migration_.*"
       ]
     },
     {
@@ -154,7 +155,6 @@
       "name" : ":features:ftue:impl",
       "includeRegex" : [
         "screen_welcome_.*",
-        "screen_migration_.*",
         "screen_notification_optin_.*"
       ]
     },