2022-June-22 - Prerelease - 2.6.964

Streamline headless launcher structure (#10723)

* Move InGameLobbyWatcherWrapper into constructors

* Enhance logic flow

* Drop interface to allow better argument flow

* Restructure initialization order to make field final

* Simplify always true conditions

* Remove redundant interface

* Remove redundant null checks

* Avoid duplicated code

* Add `@Nullable` annotation

* Simplify lambda

* Remove redundant concatenation

* Rename static method to be less confusing