GDExtension: Static code attempting to manage memory before GDExtension is initialized results in a crash.

### Tested versions

4.x

### System information

N/A

### Issue description

Applies to anything using GDExtension.

Attempting to initialize objects before GDExtension starts that manage memory (such as String, Dictionary, etc.) would result in a crash.

### Steps to reproduce

```cpp
static Dictionary d; // crash
static String s; // crash
```

### Minimal reproduction project (MRP)

N/A