fix: synced WinState was causing issues on a replay attempt (MTT-4490)

[pdeschain]

Description

Was:

• BossRoom scene pickled a networkObject with WinState netvar with DontDestroyOnLoad
• PostGame scene was supposed to clean up that networkObject
• however when BossRoom scene is exited to MainMenu - that cleanup didn't happen, causing issues on an attempt to enter the BossRoom scene again

Now:

• BossRoom state passes the WinState via a new server-only PersistentGameState (plain C# class, passed in via DI)
• PostGame state is loaded, and on the server it passes the data from persistentGameState to a new NetworkBehaviour called PostGameStateData (yes, it's not a very pretty name) and it then in turn synchronizes the WinState information across all the peers.
• This way we do not need to pickle networkObjects with DontDestroyOnLoad
• Late joiners are automatically taken care of by a netvar in PostGameStateData, which in turn doesn't survive beyond the PostGame scene

Issue Number(s)

MTT-4490

Contribution checklist

• Tests have been added for boss room and/or utilities pack
• Release notes have been added to the project changelog file and/or package changelog file
• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• JIRA ticket ID is in the PR title or at least one commit message
• Include the ticket ID number within the body message of the PR to create a hyperlink

[LPLafontaineB]

Looks like this is fixing MTT-4487 as well