Refactor session management and resource cleanup

- Replaced `teardownMountedSession` and `flushEditorPackageLoaded` with a unified `SessionLifecycle` approach for managing session transitions and resource cleanup.
- Implemented `SessionLifecycle.endEditorSession` and `SessionLifecycle.endGameSession` to streamline the teardown process for editor and game sessions.
- Introduced `Assets.releaseSession` to handle GPU resource release at session end, ensuring efficient memory management.
- Updated `Game` and `Game2` reset methods to include world and canvas resource releases.
- Enhanced `MapLoader` with a new `releaseAll` method for eager GPU cache cleanup.
- Added tests to verify the new session lifecycle functionality and resource management.

This commit improves the stability and performance of in-process transitions, particularly during editor and game session changes.

further improves and addresses #1662 specifically around android gc pressure.

src/update/Check.lua

@@ -343,7 +343,9 @@ function Check.shutdown()
   if cmdCh then cmdCh:push({ cmd = "quit" }) end
   if worker then pcall(function() worker:wait() end) end
   worker, cmdCh, stateCh = nil, nil, nil
-  workerReady = false
+  workerReady = nil
 end
 
+require("src.core.SessionLifecycle").registerProcessShutdown(Check.shutdown)
+
 return Check