Refactor GlobalState usages to re-initialize statics (ISX-1840)

- Static field (in each class) initialized via RuntimeInitializeOnLoadMethod() hook
- This functionality is a bit clunky and should be refactored but that's out-of-scope for this work

Author: timkeo

Packages/com.unity.inputsystem/InputSystem/Actions/InputActionState.cs

@@ -4237,6 +4237,13 @@ internal struct GlobalState
 
         internal static GlobalState s_GlobalState;
 
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
+        private static void InitializeGlobalActionState()
+        {
+            ResetGlobals();
+            s_GlobalState = default;
+        }
+
         internal static ISavedState SaveAndResetState()
         {
             // Save current state

Packages/com.unity.inputsystem/InputSystem/Plugins/EnhancedTouch/Touch.cs

@@ -593,12 +593,14 @@ internal struct GlobalState
 #endif
         }
 
-        private static GlobalState CreateGlobalState()
-        {   // Convenient method since parameterized construction is default
-            return new GlobalState { historyLengthPerFinger = 64 };
-        }
+        internal static GlobalState s_GlobalState;
 
-        internal static GlobalState s_GlobalState = CreateGlobalState();
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
+        private static void InitializeGlobalTouchState()
+        {
+            // Touch GlobalState doesn't require Dispose operations
+            s_GlobalState = new GlobalState { historyLengthPerFinger = 64 };
+        }
 
         internal static ISavedState SaveAndResetState()
         {
@@ -609,7 +611,7 @@ internal static ISavedState SaveAndResetState()
                 () => { /* currently nothing to dispose */ });
 
             // Reset global state
-            s_GlobalState = CreateGlobalState();
+            InitializeGlobalTouchState();
 
             return savedState;
         }

Packages/com.unity.inputsystem/InputSystem/Plugins/Users/InputUser.cs

@@ -1873,6 +1873,13 @@ private struct GlobalState
 
         private static GlobalState s_GlobalState;
 
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
+        private static void InitializeGlobalUserState()
+        {
+            ResetGlobals();
+            s_GlobalState = default;
+        }
+
         internal static ISavedState SaveAndResetState()
         {
             // Save current state and provide an opaque interface to restore it